ci: Replace TravisCI with GitHub Action

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

.github/dependabot.yml

@@ -5,3 +5,7 @@ updates:
     schedule:
       interval: "weekly"
     versioning-strategy: widen
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/phpunit.yml

@@ -0,0 +1,57 @@
+name: PHPUnit
+
+on: pull_request
+
+permissions:
+  contents: read
+
+concurrency:
+  group: phpunit-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['8.1', '8.2', '8.3', '8.4']
+
+    name: PHP ${{ matrix.php-versions }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up php ${{ matrix.php-versions }}
+        uses: shivammathur/setup-php@c541c155eee45413f5b09a52248675b1a2575231 # v2.31.1
+        with:
+          php-version: ${{ matrix.php-versions }}
+          coverage: none
+          ini-file: development
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up dependencies
+        run: composer i
+
+      - name: PHPUnit with ZSH
+        run: SHELL=zsh vendor/bin/phpunit
+
+      - name: PHPUnit with BASH
+        run: SHELL=bash vendor/bin/phpunit
+
+  summary:
+    permissions:
+      contents: none
+    runs-on: ubuntu-latest
+    needs: [phpunit]
+
+    if: always()
+
+    name: phpunit-summary
+
+    steps:
+      - name: Summary status
+        run: if ${{ needs.phpunit.result != 'success' }}; then exit 1; fi