Run system tests on GitHub CI (#42688).

Patch by Katsuya HIDAKA (user:hidakatsuya).

git-svn-id: https://svn.redmine.org/redmine/trunk@23762 e93f8b46-1217-0410-a6f0-8f06a7374b81

.github/workflows/tests.yml

@@ -110,3 +110,23 @@ jobs:
       - name: Run autoload test
         run: |
           bin/rails test:autoload
+
+      # System tests use Chrome and ChromeDriver installed on the GitHub Actions Ubuntu image.
+      # They are generally updated to the latest stable versions.
+      - name: Run system tests
+        run: |
+          google-chrome --version
+          bin/rails test:system
+        env:
+          GOOGLE_CHROME_OPTS_ARGS: headless,disable-gpu,no-sandbox,disable-dev-shm-usage
+        # System tests might still be a bit unstable, so for now, even if a system test fails,
+        # output the results and consider the overall test as successful.
+        continue-on-error: true
+
+      - name: Upload system test screenshots
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: system-test-screenshots-ruby${{ matrix.ruby }}-${{ matrix.db }}
+          path: tmp/screenshots
+          if-no-files-found: ignore