Add --no-build-cache to OpAMP debug workflow

Ensures completely fresh test runs without any cached artifacts
that could mask intermittent test failures

Author: trask

.github/workflows/debug-opamp-tests.yml

@@ -50,7 +50,7 @@ jobs:
           cache-read-only: ${{ github.event_name == 'pull_request' }}
       - name: Gradle test
         run: >
-          ./gradlew :opamp-client:test --rerun-tasks
+          ./gradlew :opamp-client:test --rerun-tasks --no-build-cache
           "-PtestJavaVersion=${{ matrix.test-java-version }}"
           "-Porg.gradle.java.installations.paths=${{ steps.setup-java-test.outputs.path }}"
           "-Porg.gradle.java.installations.auto-download=false"