fix repo name for docker image publish

Author: kantord

.github/workflows/docker-publish.yml

@@ -29,12 +29,16 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Lowercase repository name
+        id: repo
+        run: echo "name=${GITHUB_REPOSITORY,,}" >> $GITHUB_OUTPUT
+
       - name: Build and push
         uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
         with:
           context: .
           push: true
           platforms: linux/amd64,linux/arm64
           tags: |
-            ghcr.io/${{ github.repository }}:latest
-            ghcr.io/${{ github.repository }}:${{ github.ref_name }}
+            ghcr.io/${{ steps.repo.outputs.name }}:latest
+            ghcr.io/${{ steps.repo.outputs.name }}:${{ github.ref_name }}