run composer validate with GitHub Actions

Author: xabbuh

.github/workflows/lint.yaml

@@ -44,6 +44,9 @@ jobs:
                   php-version: ${{ matrix.php-version }}
                   tools: composer:v2
 
+            - name: Validate composer.json and composer.lock
+              run: composer validate --no-check-publish
+
             - name: "Install dependencies"
               id: install
               run: composer install --ansi --no-interaction --no-progress