Avoid running many Linux job variants on PR

.azure/pipelines/ci-public.yml

@@ -322,164 +322,169 @@ stages:
         inputName: Linux_x64
 
   # Build Linux ARM
-  - template: jobs/default-build.yml
-    parameters:
-      jobName: Linux_arm_build
-      jobDisplayName: "Build: Linux ARM"
-      agentOs: Linux
-      buildArgs:
-        --arch arm
-        --pack
-        --all
-        --no-build-java
-        --publish
-        -p:OnlyPackPlatformSpecificPackages=true
-        -p:AssetManifestFileName=aspnetcore-Linux_arm.xml
-        $(_BuildArgs)
-        $(_PublishArgs)
-        $(_InternalRuntimeDownloadArgs)
-      artifacts:
-      - name: Linux_arm_Logs_Attempt_$(System.JobAttempt)
-        path: artifacts/log/
-        publishOnError: true
-        includeForks: true
-      - name: Linux_arm_Packages
-        path: artifacts/packages/
-
-  - ${{ if ne(variables.PostBuildSign, 'true') }}:
-    - template: jobs/codesign-xplat.yml
+  - ${{ if notin(variables['Build.Reason'], 'PullRequest') }}:
+    - template: jobs/default-build.yml
       parameters:
-        inputName: Linux_arm
+        jobName: Linux_arm_build
+        jobDisplayName: "Build: Linux ARM"
+        agentOs: Linux
+        buildArgs:
+          --arch arm
+          --pack
+          --all
+          --no-build-java
+          --publish
+          -p:OnlyPackPlatformSpecificPackages=true
+          -p:AssetManifestFileName=aspnetcore-Linux_arm.xml
+          $(_BuildArgs)
+          $(_PublishArgs)
+          $(_InternalRuntimeDownloadArgs)
+        artifacts:
+        - name: Linux_arm_Logs_Attempt_$(System.JobAttempt)
+          path: artifacts/log/
+          publishOnError: true
+          includeForks: true
+        - name: Linux_arm_Packages
+          path: artifacts/packages/
 
-  # Build Linux ARM64
-  - template: jobs/default-build.yml
-    parameters:
-      jobName: Linux_arm64_build
-      jobDisplayName: "Build: Linux ARM64"
-      agentOs: Linux
-      steps:
-      - script: ./eng/build.sh
-            --ci
-            --arch arm64
-            --pack
-            --build-installers
-            --all
-            --no-build-java
-            -p:OnlyPackPlatformSpecificPackages=true
-            $(_BuildArgs)
-            $(_InternalRuntimeDownloadArgs)
-        displayName: Run build.sh
-      artifacts:
-      - name: Linux_arm64_Logs_Attempt_$(System.JobAttempt)
-        path: artifacts/log/
-        publishOnError: true
-        includeForks: true
-      - name: Linux_arm64_Packages
-        path: artifacts/packages/
+    - ${{ if ne(variables.PostBuildSign, 'true') }}:
+      - template: jobs/codesign-xplat.yml
+        parameters:
+          inputName: Linux_arm
 
-  - ${{ if ne(variables.PostBuildSign, 'true') }}:
-    - template: jobs/codesign-xplat.yml
+  # Build Linux ARM64
+  - ${{ if notin(variables['Build.Reason'], 'PullRequest') }}:
+    - template: jobs/default-build.yml
       parameters:
-        inputName: Linux_arm64
+        jobName: Linux_arm64_build
+        jobDisplayName: "Build: Linux ARM64"
+        agentOs: Linux
+        steps:
+        - script: ./eng/build.sh
+              --ci
+              --arch arm64
+              --pack
+              --build-installers
+              --all
+              --no-build-java
+              -p:OnlyPackPlatformSpecificPackages=true
+              $(_BuildArgs)
+              $(_InternalRuntimeDownloadArgs)
+          displayName: Run build.sh
+        artifacts:
+        - name: Linux_arm64_Logs_Attempt_$(System.JobAttempt)
+          path: artifacts/log/
+          publishOnError: true
+          includeForks: true
+        - name: Linux_arm64_Packages
+          path: artifacts/packages/
 
-  # Build Linux Musl x64
-  - template: jobs/default-build.yml
-    parameters:
-      jobName: Linux_musl_x64_build
-      jobDisplayName: "Build: Linux Musl x64"
-      agentOs: Linux
-      container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-build-amd64
-      buildArgs:
-        --arch x64
-        --os-name linux-musl
-        --pack
-        --all
-        --no-build-java
-        --publish
-        -p:OnlyPackPlatformSpecificPackages=true
-        -p:AssetManifestFileName=aspnetcore-Linux_musl_x64.xml
-        $(_BuildArgs)
-        $(_PublishArgs)
-        $(_InternalRuntimeDownloadArgs)
-      disableComponentGovernance: true
-      artifacts:
-      - name: Linux_musl_x64_Logs_Attempt_$(System.JobAttempt)
-        path: artifacts/log/
-        publishOnError: true
-        includeForks: true
-      - name: Linux_musl_x64_Packages
-        path: artifacts/packages/
+    - ${{ if ne(variables.PostBuildSign, 'true') }}:
+      - template: jobs/codesign-xplat.yml
+        parameters:
+          inputName: Linux_arm64
 
-  - ${{ if ne(variables.PostBuildSign, 'true') }}:
-    - template: jobs/codesign-xplat.yml
+  # Build Linux Musl x64
+  - ${{ if notin(variables['Build.Reason'], 'PullRequest') }}:
+    - template: jobs/default-build.yml
       parameters:
-        inputName: Linux_musl_x64
+        jobName: Linux_musl_x64_build
+        jobDisplayName: "Build: Linux Musl x64"
+        agentOs: Linux
+        container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-build-amd64
+        buildArgs:
+          --arch x64
+          --os-name linux-musl
+          --pack
+          --all
+          --no-build-java
+          --publish
+          -p:OnlyPackPlatformSpecificPackages=true
+          -p:AssetManifestFileName=aspnetcore-Linux_musl_x64.xml
+          $(_BuildArgs)
+          $(_PublishArgs)
+          $(_InternalRuntimeDownloadArgs)
+        disableComponentGovernance: true
+        artifacts:
+        - name: Linux_musl_x64_Logs_Attempt_$(System.JobAttempt)
+          path: artifacts/log/
+          publishOnError: true
+          includeForks: true
+        - name: Linux_musl_x64_Packages
+          path: artifacts/packages/
 
-  # Build Linux Musl ARM
-  - template: jobs/default-build.yml
-    parameters:
-      jobName: Linux_musl_arm_build
-      jobDisplayName: "Build: Linux Musl ARM"
-      agentOs: Linux
-      useHostedUbuntu: false
-      container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-build-amd64
-      buildArgs:
-        --arch arm
-        --os-name linux-musl
-        --pack
-        --all
-        --no-build-java
-        --publish
-        -p:OnlyPackPlatformSpecificPackages=true
-        -p:AssetManifestFileName=aspnetcore-Linux_musl_arm.xml
-        $(_BuildArgs)
-        $(_PublishArgs)
-        $(_InternalRuntimeDownloadArgs)
-      artifacts:
-      - name: Linux_musl_arm_Logs_Attempt_$(System.JobAttempt)
-        path: artifacts/log/
-        publishOnError: true
-        includeForks: true
-      - name: Linux_musl_arm_Packages
-        path: artifacts/packages/
+    - ${{ if ne(variables.PostBuildSign, 'true') }}:
+      - template: jobs/codesign-xplat.yml
+        parameters:
+          inputName: Linux_musl_x64
 
-  - ${{ if ne(variables.PostBuildSign, 'true') }}:
-    - template: jobs/codesign-xplat.yml
+  # Build Linux Musl ARM
+  - ${{ if notin(variables['Build.Reason'], 'PullRequest') }}:
+    - template: jobs/default-build.yml
       parameters:
-        inputName: Linux_musl_arm
+        jobName: Linux_musl_arm_build
+        jobDisplayName: "Build: Linux Musl ARM"
+        agentOs: Linux
+        useHostedUbuntu: false
+        container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-build-amd64
+        buildArgs:
+          --arch arm
+          --os-name linux-musl
+          --pack
+          --all
+          --no-build-java
+          --publish
+          -p:OnlyPackPlatformSpecificPackages=true
+          -p:AssetManifestFileName=aspnetcore-Linux_musl_arm.xml
+          $(_BuildArgs)
+          $(_PublishArgs)
+          $(_InternalRuntimeDownloadArgs)
+        artifacts:
+        - name: Linux_musl_arm_Logs_Attempt_$(System.JobAttempt)
+          path: artifacts/log/
+          publishOnError: true
+          includeForks: true
+        - name: Linux_musl_arm_Packages
+          path: artifacts/packages/
 
-  # Build Linux Musl ARM64
-  - template: jobs/default-build.yml
-    parameters:
-      jobName: Linux_musl_arm64_build
-      jobDisplayName: "Build: Linux Musl ARM64"
-      agentOs: Linux
-      useHostedUbuntu: false
-      container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-build-amd64
-      buildArgs:
-        --arch arm64
-        --os-name linux-musl
-        --pack
-        --all
-        --no-build-java
-        --publish
-        -p:OnlyPackPlatformSpecificPackages=true
-        -p:AssetManifestFileName=aspnetcore-Linux_musl_arm64.xml
-        $(_BuildArgs)
-        $(_PublishArgs)
-        $(_InternalRuntimeDownloadArgs)
-      artifacts:
-      - name: Linux_musl_arm64_Logs_Attempt_$(System.JobAttempt)
-        path: artifacts/log/
-        publishOnError: true
-        includeForks: true
-      - name: Linux_musl_arm64_Packages
-        path: artifacts/packages/
+    - ${{ if ne(variables.PostBuildSign, 'true') }}:
+      - template: jobs/codesign-xplat.yml
+        parameters:
+          inputName: Linux_musl_arm
 
-  - ${{ if ne(variables.PostBuildSign, 'true') }}:
-    - template: jobs/codesign-xplat.yml
+  # Build Linux Musl ARM64
+  - ${{ if notin(variables['Build.Reason'], 'PullRequest') }}:
+    - template: jobs/default-build.yml
       parameters:
-        inputName: Linux_musl_arm64
+        jobName: Linux_musl_arm64_build
+        jobDisplayName: "Build: Linux Musl ARM64"
+        agentOs: Linux
+        useHostedUbuntu: false
+        container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-build-amd64
+        buildArgs:
+          --arch arm64
+          --os-name linux-musl
+          --pack
+          --all
+          --no-build-java
+          --publish
+          -p:OnlyPackPlatformSpecificPackages=true
+          -p:AssetManifestFileName=aspnetcore-Linux_musl_arm64.xml
+          $(_BuildArgs)
+          $(_PublishArgs)
+          $(_InternalRuntimeDownloadArgs)
+        artifacts:
+        - name: Linux_musl_arm64_Logs_Attempt_$(System.JobAttempt)
+          path: artifacts/log/
+          publishOnError: true
+          includeForks: true
+        - name: Linux_musl_arm64_Packages
+          path: artifacts/packages/
+
+    - ${{ if ne(variables.PostBuildSign, 'true') }}:
+      - template: jobs/codesign-xplat.yml
+        parameters:
+          inputName: Linux_musl_arm64
 
   - ${{ if ne(parameters.skipTests, 'true') }}:
     # Test jobs