2nd attempt to show test results of PRs from fork repositories

Integrate the unit-test job into the build job, so that the PR is
accessible.

.github/workflows/maven.yaml

@@ -48,3 +48,31 @@ jobs:
         if-no-files-found: error
         path: |
           ${{ github.workspace }}/**/target/surefire-reports/*.xml
+
+  unit-test-results:
+    name: Unit Test Results
+	needs: build
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.conclusion != 'skipped'
+    permissions:
+      checks: write
+      pull-requests: write
+
+    steps:
+      - name: Download and Extract Artifacts
+        run: |
+           mkdir -p artifacts && cd artifacts
+
+           artifacts_url=${{ github.event.workflow_run.artifacts_url }}
+
+           gh api "$artifacts_url" -q '.artifacts[] | [.name, .archive_download_url] | @tsv' | while read artifact
+           do
+             IFS=$'\t' read name url <<< "$artifact"
+             gh api $url > "$name.zip"
+             unzip -d "$name" "$name.zip"
+           done
+
+      - name: Publish Unit Test Results
+        uses: EnricoMi/publish-unit-test-result-action@82082dac68ad6a19d980f8ce817e108b9f496c2a
+        with:
+          files: "artifacts/**/*.xml"