fix(ci): Reject only added or modified png/jpg images (#610)

* fix(ci): Reject only added or modified png/jpg images

* fix(ci): Fix link in workflow

Author: lucasssvaz

.github/workflows/pr-reject-png-jpg.yml

@@ -15,14 +15,14 @@ jobs:
 
       - name: Check for JPEG and PNG files
         run: |
-          # Check for .jpeg, .jpg, .JPG, .JPEG, .png, .PNG files
-          IMAGE_FILES=$(git diff --name-only origin/main...HEAD | (grep -iE '\.(jpe?g|png)$' || true) )
+          # Check for .jpeg, .jpg, .JPG, .JPEG, .png, .PNG files (only added/modified, not deleted)
+          IMAGE_FILES=$(git diff --name-only --diff-filter=AM origin/main...HEAD | (grep -iE '\.(jpe?g|png)$' || true) )
 
           if [ -n "$IMAGE_FILES" ]; then
             echo "Rejecting merge. PR contains the following JPEG or PNG files:"
             echo "$IMAGE_FILES"
             echo "Please convert these files to WebP format. For details, see"
-            echo "https://developer.espressif.com/pages/contribution-guide/writing-content/#use-webp-for-raster-images."
+            echo "https://developer.espressif.com/pages/contribution-guide/writing-content/#use-webp-for-raster-images"
             exit 1
 
           else