final fix

Author: MathewNWSH

.github/workflows/docker-publish.yml

@@ -1,3 +1,11 @@
+name: build and push docker image
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -24,11 +32,11 @@ jobs:
         id: vars
         run: echo "sha_short=${GITHUB_SHA::7}" >> $GITHUB_OUTPUT
 
-      - name: prepare image name (lowercase!)
+      - name: prepare image name (lowercase)
         id: img
         run: |
           IMAGE="ghcr.io/${{ github.repository_owner }}/my-app"
-          echo "name=$(echo $IMAGE | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
+          echo "name=$(echo "$IMAGE" | tr '[:upper:]' '[:lower:]')" >> "$GITHUB_OUTPUT"
 
       - name: build and push
         uses: docker/build-push-action@v6