Allow job-summary only on failure

Instead of a binary true/false option, it is now possible to only add
a Job Summary when the build failed. This applies both to the overall
Job Summary added to the workflow run, and to the new PR comment feature.

.github/workflows/demo-pr-build-scan-comment.yml

@@ -3,7 +3,7 @@ on:
   pull_request:
     types: [assigned, review_requested]
 jobs:
-  gradle:
+  successful-build-with-always-comment:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout project sources
@@ -11,8 +11,37 @@ jobs:
     - name: Setup Gradle
       uses: ./
       with:
-        add-pr-comment: true
+        add-job-summary-as-pr-comment: always
     - name: Run build with Gradle wrapper
       id: gradle
       working-directory: .github/workflow-samples/kotlin-dsl
       run: ./gradlew build --scan
+
+  successful-build-with-comment-on-failure:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout project sources
+      uses: actions/checkout@v4
+    - name: Setup Gradle
+      uses: ./
+      with:
+        add-job-summary-as-pr-comment: on-failure
+    - name: Run build with Gradle wrapper
+      id: gradle
+      working-directory: .github/workflow-samples/kotlin-dsl
+      run: ./gradlew build --scan
+
+  failing-build-with-comment-on-failure:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout project sources
+      uses: actions/checkout@v4
+    - name: Setup Gradle
+      uses: ./
+      with:
+        add-job-summary-as-pr-comment: on-failure
+    - name: Run build with Gradle wrapper
+      id: gradle
+      working-directory: .github/workflow-samples/kotlin-dsl
+      run: ./gradlew no-a-real-task --scan
+      continue-on-error: true