chore(workflows): normalize image name to lowercase in Docker publish workflow

- Added a step to convert the image name to lowercase and store it in the environment variable `IMAGE_NAME_LOWER`.
- Updated references in the Docker metadata and build steps to use the normalized image name, ensuring consistency across multi-platform builds.

Author: michaelgpt

.github/workflows/docker-publish.yml

@@ -42,6 +42,9 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Normalize image name to lowercase
+        run: echo "IMAGE_NAME_LOWER=${IMAGE_NAME,,}" >> $GITHUB_ENV
+
       # Set up BuildKit Docker container builder to be able to build
       # multi-platform images and export cache
       # https://github.com/docker/setup-buildx-action
@@ -67,7 +70,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LOWER }}
 
       # Build and push per-arch image by digest (don't push on PR)
       # https://github.com/docker/build-push-action
@@ -82,7 +85,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true
+          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LOWER }},push-by-digest=true
 
       - name: Export digest
         if: ${{ github.event_name != 'pull_request' }}
@@ -129,7 +132,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LOWER }}
 
       - name: Create and push multi-arch manifest
         run: |