Add specific action for UI tests.

.github/workflows/ui-tests.yml

@@ -0,0 +1,38 @@
+name: 'UI Tests'
+
+on:
+  push:
+    branches:
+      - main
+  pull_request_target:
+
+jobs:
+  ui-tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        browser: [ firefox-container, chrome-container ]
+
+    runs-on: [ubuntu-latest]
+    name: '${{ matrix.browser }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+          check-latest: true
+          cache: 'maven'
+      - name: Set up Maven
+        uses: stCarolas/setup-maven@v5
+        with:
+          maven-version: 3.9.9
+      - name: Build warnings plugin and download dependencies
+        run: mvn -V --color always -ntp verify -Pskip --file plugin/pom.xml
+      - name: Run UI tests on ${{ matrix.browser }}
+        env:
+          BROWSER: ${{ matrix.browser }}
+          SKIP_UPDATES: 'true'
+        run: mvn -V --color always -ntp test --file ui-tests/pom.xml -Dgpg.skip -Dsurefire.rerunFailingTestsCount=1