Print JVM thread dumps if the build is cancelled

See gh-39761

Author: wilkinsona

.github/actions/print-jvm-thread-dumps/action.yml

@@ -3,12 +3,12 @@ description: Prints a thread dump for all running JVMs
 runs:
   using: composite
   steps:
-    - run: |
+    - shell: bash
+      run: |
         for java_pid in $(jps -q -J-XX:+PerfDisableSharedMem); do
           echo "------------------------ pid $java_pid ------------------------"
           cat /proc/$java_pid/cmdline | xargs -0 echo
           jcmd $java_pid Thread.print -l
           jcmd $java_pid GC.heap_info
         done
-        exit 0
-      shell: bash
+        exit 0

.github/workflows/windows-build.yml

@@ -44,6 +44,9 @@ jobs:
           GRADLE_ENTERPRISE_CACHE_USERNAME: ${{ secrets.GRADLE_ENTERPRISE_CACHE_USER }}
           GRADLE_ENTERPRISE_CACHE_PASSWORD: ${{ secrets.GRADLE_ENTERPRISE_CACHE_PASSWORD }}
         run: ./gradlew build
+      - name: Print JVM thread dumps when cancelled
+        uses: ./.github/actions/print-jvm-thread-dumps
+        if: cancelled()
       - name: Send notification
         uses: ./.github/actions/send-notification
         if: always()