Add GitHub workflow to validate samples

Author: kpavlov

.github/workflows/samples.yml

@@ -0,0 +1,89 @@
+name: Build Samples
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'samples/**'
+  push:
+    branches: [ main ]
+#    paths:
+#      - 'samples/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  # Cancel only when the run is NOT on `main` branch
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main'  }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        sample:
+          - kotlin-mcp-client
+          - kotlin-mcp-server
+          - weather-stdio-server
+
+    name: Validate PR
+    timeout-minutes: 10
+    env:
+      JAVA_OPTS: "-Xmx8g -Dfile.encoding=UTF-8 -Djava.awt.headless=true -Dkotlin.daemon.jvm.options=-Xmx6g"
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          java-version: 21
+          distribution: 'temurin'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v5
+        with:
+          add-job-summary: 'always'
+          cache-read-only: true
+
+      - name: Build with Gradle
+        working-directory: matrix.sample
+        run: |-
+          ./../../gradlew --no-daemon --rerun-tasks \
+            clean \
+            ktlintCheck \
+            build \
+            koverLog koverHtmlReport \
+            publishToMavenLocal
+
+      - name: "Build Sample: ${{ matrix.sample }}"
+        working-directory: ./samples/${{ matrix.sample }}
+        run: ./../../gradlew --no-daemon --rerun-tasks clean build
+
+      - name: Upload Reports
+        if: ${{ !cancelled() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: reports
+          path: |
+            **/build/reports/
+
+      - name: Disable Auto-Merge on Fail
+        if: failure() && github.event_name == 'pull_request'
+        run: gh pr merge --disable-auto "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  report:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Publish Test Report
+      uses: mikepenz/action-junit-report@v5
+      if: ${{ !cancelled() }} # always run even if the previous step fails
+      with:
+        report_paths: '**/test-results/**/TEST-*.xml'
+        detailed_summary: true
+        flaky_summary: true
+        include_empty_in_summary: false
+        include_time_in_summary: true
+        annotate_only: true