Added github actions workflow to lint and test when pushing code

.github/workflows/push.yaml

@@ -0,0 +1,38 @@
+name: Lint and Test
+
+on: push
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php_version: [ '7.2', '7.3', '7.4', '8.0', '8.1' ]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php_version }}
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v3
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ matrix.php_version}}-${{ hashFiles('**/composer.lock') }}
+
+      - name: Install dependencies
+        run: composer install --prefer-source #--no-progress
+
+      - name: Run test suite
+        run: composer run-script ci