tag ghcr in build step (#22)

.github/workflows/ghcr.yml

@@ -7,8 +7,6 @@ on:
   push:
     tags:
       - v*
-    pull_request: []
-  workflow_dispatch:
 
 jobs:
   push-image:
@@ -20,15 +18,14 @@ jobs:
       - uses: actions/checkout@v4
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
+      - name: Set IMAGE_ID
+        run: echo "IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME" | tr '[A-Z]' '[a-z]' >> $GITHUB_ENV
       - name: Build image
-        run: docker buildx build . --platform linux/amd64,linux/arm64 --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}" --push
+        run: docker buildx build . --platform linux/amd64,linux/arm64 --tag $IMAGE_ID --label "runnumber=${GITHUB_RUN_ID}" --push
       - name: Log in to registry
         run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
-
       - name: Push image
         run: |
-          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
-          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
           VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
           [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
           [ "$VERSION" == "master" ] && VERSION=latest