enforce-webp-only.yml

name: Enforce WEBP Image Format                                                            
                                                                                               
    on:                                                                                        
      pull_request:                                                                            
        paths:                                                                                 
          - '**.png'                                                                           
          - '**.jpg'                                                                           
          - '**.jpeg'                                                                          
          - '**.gif'                                                                           
          - '**.bmp'                                                                           
          - '**.tiff'                                                                          
          - '**.ico'                                                                           
                                                                                               
    jobs:                                                                                      
      check-images:                                                                            
        runs-on: ubuntu-latest                                                                 
        steps:                                                                                 
          - name: Checkout code                                                                
            uses: actions/checkout@v2                                                          
                                                                                               
          - name: Check for non-WEBP images                                                    
            run: |                                                                             
              files=$(git diff --name-only ${{ github.event.before }} ${{                      
  github.sha }} -- '*.png' '*.jpg' '*.jpeg' '*.gif' '*.bmp' '*.tiff' '*.ico')                  
              if [ -n "$files" ]; then                                                         
                echo "The following non-WEBP image files have been found in the                
  pull request:"                                                                               
                echo "$files"                                                                  
                exit 1                                                                         
              else                                                                             
                echo "No non-WEBP images found. Proceeding..."                                 
              fi