[ci skip] Make test results viewable in-browser and downloadable (#10055)

* Post test results

* empty commit

* Make a test fail

* Add missing check

* Disable commenting

* Revert "Make a test fail"

This reverts commit d919653c2b.

* remove commenting permission

.github/workflows/build.yml

@@ -24,9 +24,9 @@ jobs:
         java: [17]
       fail-fast: true
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: JDK ${{ matrix.java }}
-        uses: actions/setup-java@v3.11.0
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java }}
           distribution: 'temurin'
@@ -77,13 +77,32 @@ jobs:
       - name: Build
         run: ./gradlew build --stacktrace
 
+      - name: Upload Test Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: Test Results (${{ matrix.java }})
+          path: |
+            **/build/test-results/test/TEST-*.xml
+
       - name: Create Paperclip Jar
         if: fromJSON(steps.determine.outputs.result).action == 'paperclip'
         run: ./gradlew createReobfPaperclipJar --stacktrace
 
       - name: Upload Paperclip Jar
         if: fromJSON(steps.determine.outputs.result).action == 'paperclip'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: paper-${{ fromJSON(steps.determine.outputs.result).pr }}
           path: build/libs/paper-paperclip-*-reobf.jar
+  event_file:
+    name: "Event File"
+    # Only run on PRs if the source branch is on someone else's repo
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Upload
+        uses: actions/upload-artifact@v4
+        with:
+          name: Event File
+          path: ${{ github.event_path }}

.github/workflows/test_results.yml

@@ -0,0 +1,32 @@
+name: Test Results
+
+on:
+  workflow_run:
+    workflows: [ "Build Paper" ]
+    types:
+      - completed
+permissions: { }
+
+jobs:
+  test-results:
+    name: Test Results
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.conclusion != 'skipped'
+    permissions:
+      checks: write
+      # for downloading test result artifacts
+      actions: read
+    steps:
+      - name: Download and Extract Artifacts
+        uses: dawidd6/action-download-artifact@v3
+        with:
+          run_id: ${{ github.event.workflow_run.id }}
+          path: artifacts
+      - name: Publish Test Results
+        uses: EnricoMi/publish-unit-test-result-action@v2
+        with:
+          commit: ${{ github.event.workflow_run.head_sha }}
+          event_file: artifacts/Event File/event.json
+          event_name: ${{ github.event.workflow_run.event }}
+          files: "artifacts/**/*.xml"
+          comment_mode: off