fix: improve JSON format with awk and add matrix debug output

.gitea/workflows/build-images.yml

@@ -59,8 +59,8 @@ jobs:
             echo "has_changes=false" >> $GITHUB_OUTPUT
             echo "image_list=[]" >> $GITHUB_OUTPUT
           else
-            # Convert to JSON array - simple approach
-            JSON="[$(echo "$IMAGES" | sed 's/,/","/g' | sed 's/^/"/' | sed 's/$/"/' )]"
+            # Format JSON avec awk pour être sûr
+            JSON=$(printf '%s\n' "$IMAGES" | tr ',' '\n' | awk '{printf "\"%s\",", $0}' | sed 's/,$//' | sed 's/^/[/' | sed 's/$/]/')
             echo "JSON: $JSON"
             echo "has_changes=true" >> $GITHUB_OUTPUT
             echo "image_list=$JSON" >> $GITHUB_OUTPUT
@@ -77,6 +77,11 @@ jobs:
         image: ${{ fromJson(needs.detect-changes.outputs.image_list) }}
       fail-fast: false
     steps:
+      - name: Debug matrix
+        run: |
+          echo "Matrix image value: '${{ matrix.image }}'"
+          echo "All matrix: ${{ toJson(matrix) }}"
+
       - name: Install git and checkout
         run: |
           apk add --no-cache git