chore: replace GH files

.github/FUNDING.yml

@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+open_collective: leaf
+github: leafsphp

.github/workflows/tests.yml

@@ -0,0 +1,43 @@
+name: Run Tests
+
+on: ['push', 'pull_request']
+
+env:
+  MYSQL_DATABASE: leaf
+  DB_USER: root
+  DB_PASSWORD: root
+
+jobs:
+  ci:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        php: ['7.4', '8.0', '8.1', '8.2', '8.3']
+
+    name: PHP ${{ matrix.php }} - ${{ matrix.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Initialize MySQL
+        run: sudo systemctl start mysql.service
+
+      - name: Initialize first database
+        run: |
+          mysql -e 'CREATE DATABASE ${{ env.MYSQL_DATABASE }};' \
+          -u${{ env.DB_USER }} -p${{ env.DB_PASSWORD }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+          coverage: xdebug
+
+      - name: Install PHP dependencies
+        run: composer update --no-interaction --no-progress
+
+      - name: All Tests
+        run: composer run-script test