Lint the ruleset.xml file

Author: williamdes

.github/workflows/tests.yml

@@ -9,14 +9,18 @@ on:
 
 jobs:
     test-ruleset:
-        name: Test on php ${{ matrix.php-version }} and ${{ matrix.os }}
-        runs-on: ${{ matrix.os }}
+        name: Test rules on PHP ${{ matrix.php-version }}
+        runs-on: ubuntu-latest
         strategy:
             matrix:
                 php-version: ["7.1", "7.2", "7.3", "7.4", "8.0"]
-                os: [ubuntu-latest]
         steps:
             - uses: actions/checkout@v3
+            - name: Install xmllint
+              run: |
+                sudo apt update
+                sudo apt install --no-install-recommends -y libxml2-utils
+                sudo apt clean
             - name: Use php ${{ matrix.php-version }}
               uses: shivammathur/setup-php@v2
               with:
@@ -28,5 +32,7 @@ jobs:
                   key: composer-cache
             - name: Install dependencies
               run: composer install
+            - name: Lint the ruleset
+              run: xmllint --noout --schema ./vendor/squizlabs/php_codesniffer/phpcs.xsd PhpMyAdmin/ruleset.xml
             - name: Run php tests
               run: ./vendor/bin/phpcs --standard=PhpMyAdmin -vv | grep -oF "Processing ruleset $(pwd)/PhpMyAdmin/ruleset.xml"