Update docker-image.yml (#57)

* Update docker-image.yml

Signed-off-by: fedjo <mari.giorgos@gmail.com>

* Add missing '$'

Signed-off-by: fedjo <mari.giorgos@gmail.com>

---------

Signed-off-by: fedjo <mari.giorgos@gmail.com>

Author: fedjo

.github/workflows/docker-image.yml

@@ -36,14 +36,18 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Set lowercase repository name
+        run: |
+          echo "REPO_LOWER=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
+
       - name: Build and push Docker image
         id: docker_build
         uses: docker/build-push-action@v6
         with:
           context: .
           push: true
           tags: |
-            ghcr.io/${{ github.repository }}:${{ github.ref_name }}
+            ghcr.io/${{ env.REPO_LOWER }}:${{ github.ref_name }}
             ${{ github.ref_name == 'main' && format('ghcr.io/{0}:latest', github.repository) || '' }}
           cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-to: type=gha,mode=max