added workflows

.github/dependabot.yml

@@ -0,0 +1,15 @@
+---
+version: 2
+updates:
+  - package-ecosystem: composer
+    directory: /
+    schedule:
+      interval: weekly
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+  - package-ecosystem: composer
+    directory: /tests
+    schedule:
+      interval: weekly

.github/workflows/tests.yml

@@ -0,0 +1,66 @@
+name: tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  linux_tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [ 8.0, 8.1 ]
+
+    name: PHP ${{ matrix.php }} on Linux
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, curl, libxml, mbstring, zip, http
+          tools: composer:v2
+          coverage: none
+
+      - name: Install dependencies
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Execute tests
+        run: composer run test
+
+  windows_tests:
+    runs-on: windows-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [ 8.0, 8.1 ]
+
+    name: PHP ${{ matrix.php }} on Windows
+
+    steps:
+
+      - name: Set git to use LF
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, curl, libxml, mbstring, zip, http
+          tools: composer:v2
+          coverage: none
+          ini-values: memory_limit=512M
+
+      - name: Install dependencies
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Execute tests
+        run: composer run test