fix: Set lowercase repository name for Docker image tag

Author: Tosox

.github/workflows/docker.yaml

@@ -31,6 +31,9 @@ jobs:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set lowercase repository name
+        run: |
+        echo "REPO_LC=${GITHUB_REPOSITORY@L}" >> $GITHUB_ENV
       # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
       # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see [Usage](https://github.com/docker/build-push-action#usage) in the README of the `docker/build-push-action` repository.
       # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
@@ -40,4 +43,4 @@ jobs:
         with:
           context: .
           push: true
-          tags: ${{ env.REGISTRY }}/${{ github.repository }}:${{ github.ref_name }}
+          tags: ${{ env.REGISTRY }}/${{ env.REPO_LC }}:${{ github.ref_name }}