ci: fix name must be lowercase

Author: Daniele-rolli

.github/workflows/publish.yml

@@ -36,6 +36,9 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+          
+      - name: Set lowercase image name
+        run: echo "IMAGE_NAME=ghcr.io/${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
@@ -45,8 +48,8 @@ jobs:
           platforms: ${{ matrix.platform }}
           push: true
           tags: |
-            ghcr.io/${{ github.repository_owner }}/beaver-notes:latest
-            ghcr.io/${{ github.repository_owner }}/beaver-notes:${{ github.sha }}
+            ${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:${{ github.sha }}
           labels: |
             org.opencontainers.image.source=${{ github.repository }}
             org.opencontainers.image.description="Beaver Notes Dockerized"