bugfixes in gh package action

.github/workflows/build.yaml

@@ -10,7 +10,7 @@ env:
   IMAGE_NAME: ${{ github.event_name == 'release' && 'brewery' || 'brewery-staging' }}
 
 jobs:
-  push_backend:
+  push_package:
     if: ${{ github.event_name == 'release' || (github.event_name == 'push' && !contains(github.event.head_commit.message, '#no-deploy')) }}
     runs-on: ubuntu-latest
     permissions:
@@ -27,7 +27,7 @@ jobs:
         #
       - name: Push image
         run: |
-          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$BACKEND_IMAGE_NAME
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
 
           # This changes all uppercase characters to lowercase.
           IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')