[CI] As soon as a PR is created or updated, create pending (yellow) commit statuses for all Buildbot jobs

Author: DilumAluthge

.github/workflows/pending.yml

@@ -0,0 +1,87 @@
+# This is just a short-term solution until we have migrated all of CI to Buildkite.
+#
+# TODO: delete this file once we have migrated all of CI to Buildkite.
+#
+# TODO: disable GitHub Actions on the `JuliaLang/julia` repository once we have migrated all
+# of CI to Buildkite.
+
+name: Pending
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'release-*'
+  pull_request:
+    branches:
+      - 'master'
+      - 'release-*'
+
+permissions:
+  statuses:            write
+  actions:             none
+  checks:              none
+  contents:            none
+  deployments:         none
+  issues:              none
+  discussions:         none
+  packages:            none
+  pull-requests:       none
+  repository-projects: none
+  security-events:     none
+
+jobs:
+  pending:
+    name: pending
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - run: echo "SHA=${{ github.event.pull_request.head.sha }}" >> $GITHUB_ENV
+        if: github.event_name == 'pull_request'
+
+      - run: echo "SHA=${{ env.GITHUB_SHA }}" >> $GITHUB_ENV
+        if: github.event_name != 'pull_request'
+
+        run: echo "The SHA is $SHA"
+        env:
+          SHA: ${{ env.SHA }}
+
+      - run: |
+          declare -a context_list=(
+                "buildbot/package_freebsd64"
+                "buildbot/package_linux32"
+                "buildbot/package_linux64"
+                "buildbot/package_linuxaarch64"
+                "buildbot/package_linuxarmv7l"
+                "buildbot/package_linuxppc64le"
+                "buildbot/package_macos64"
+                "buildbot/package_macosaarch64"
+                "buildbot/package_musl64"
+                "buildbot/package_win32"
+                "buildbot/package_win64"
+                "buildbot/tester_freebsd64"
+                "buildbot/tester_linux32"
+                "buildbot/tester_linux64"
+                "buildbot/tester_linuxaarch64"
+                "buildbot/tester_linuxarmv7l"
+                "buildbot/tester_linuxppc64le"
+                "buildbot/tester_macos64"
+                "buildbot/tester_macosaarch64"
+                "buildbot/tester_musl64"
+                "buildbot/tester_win32"
+                "buildbot/tester_win64"
+                )
+          for context in "${context_list[@]}"
+          do
+            curl \
+              -X POST \
+              -H "Authorization: token $GITHUB_TOKEN" \
+              -H "Accept: application/vnd.github.v3+json" \
+              -d "{\"state\": \"$STATE\", \"context\": \"$context\"}" \
+            https://api.github.com/repos/JuliaLang/julia/statuses/$SHA
+          done
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SHA: ${{ env.SHA }}
+          STATE: "pending"