refactor(get-images-from-files): to return json array

.gitea/workflows/ci.yaml

@@ -48,10 +48,11 @@ jobs:
             - get-images-from-files/test-values-helmfile.yaml
       - name: Check image formats extracted
         run: |
-          images="${{ steps.giff.outputs.images }}"
-          echo "Extracted: $images"
+          images='${{ steps.giff.outputs.images }}'
+          echo "JSON array (for manual inspection):"
+          echo "$images" | jq .
           echo ""
-          check() { echo -n "  $1: "; echo "$images" | grep -q "$2" && echo "OK" || { echo "FAIL (not found)"; exit 1; }; }
+          check() { echo -n "  $1: "; echo "$images" | jq -e --arg ref "$2" 'index($ref) != null' >/dev/null && echo "OK" || { echo "FAIL (not found)"; exit 1; }; }
           
           # Dockerfile-only refs
           check "Dockerfile registry+tag (nginx:v1)" "example.com/library/nginx:v1"
@@ -72,10 +73,10 @@ jobs:
           
           # Shared ref (in both files) — must appear exactly once
           check "Shared ref present (distroless/static:nonroot)" "example.com/distroless/static:nonroot"
-          count=$(echo "$images" | tr ',' '\n' | grep -c 'example.com/distroless/static:nonroot' || true)
+          count=$(echo "$images" | jq '[.[] | select(. == "example.com/distroless/static:nonroot")] | length')
           echo -n "  Shared ref appears once (no duplicates): "
           [ "$count" -eq 1 ] && echo "OK (count=$count)" || { echo "FAIL (count=$count, expected 1)"; exit 1; }
-          total=$(echo "$images" | tr ',' '\n' | grep -c . || true)
+          total=$(echo "$images" | jq 'length')
           echo -n "  Total unique refs: "
           [ "$total" -eq 10 ] && echo "OK ($total)" || { echo "FAIL (got $total, expected 10)"; exit 1; }