Add PHP_CodeSniffer linter

Author: bitcryptic-gw

.github/workflows/package.yml

@@ -14,6 +14,13 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+	- name: Run PHP_CodeSniffer
+	  uses: php-actions/phpcs@v1
+	  with:
+	    php_version: '8.1'
+	    path: proxy-aware-https-fix.php
+	    standard: WordPress
+
       - name: Zip plugin
         run: zip -r proxy-aware-https-fix.zip proxy-aware-https-fix.php README.md LICENSE CHANGELOG.md