Fail job if leak was detected (java-native-access#126)

Motivation:

We should fail the build when a leak was detected

Modifications:

Add extra step which will fail the job when a leak was found

Result:

Leaks will fail the job

.github/workflows/ci-build.yml

@@ -35,7 +35,17 @@ jobs:
 
       - name: Build project with leak detection
         if: ${{ github.event_name == 'pull_request' }}
-        run: docker-compose -f docker/docker-compose.centos-6.yaml -f docker/docker-compose.centos-6.18.yaml run build-leak
+        run: docker-compose -f docker/docker-compose.centos-6.yaml -f docker/docker-compose.centos-6.18.yaml run build-leak  | tee build-leak.output
+
+      - name: Checking for detected leak
+        if: ${{ github.event_name == 'pull_request' }}
+        run: |
+          if grep -q 'LEAK:' build-leak.output ; then
+            echo "Leak detected, please inspect build log"
+            exit 1
+          else
+            echo "No Leak detected"
+          fi
 
       - uses: actions/upload-artifact@v2
         if: ${{ failure() }}