fix: repo owner in build action

.github/workflows/build-image.yml

@@ -8,6 +8,8 @@ on:
 
 env:
   IMAGE_NAME: kroegen
+  # Cannot use 'github.repository_owner' because it is not lowercase
+  REPO_OWNER: schuttejan
 
 jobs:
 
@@ -25,7 +27,7 @@ jobs:
       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 }}/$IMAGE_NAME
+          IMAGE_ID=ghcr.io/$REPO_OWNER/$IMAGE_NAME
           VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
           [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
           [ "$VERSION" == "main" ] && VERSION=latest