Fix Docker publish: lowercase GHCR repository owner

github.repository_owner is 'ApartsinProjects' (mixed case) but Docker
registry tags must be lowercase. Pipe through tr to fix.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: apartsin

.github/workflows/publish.yml

@@ -81,16 +81,18 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Extract version
-        id: version
-        run: echo "tag=${GITHUB_REF_NAME:-latest}" >> $GITHUB_OUTPUT
+      - name: Extract version and owner
+        id: meta
+        run: |
+          echo "tag=${GITHUB_REF_NAME:-latest}" >> $GITHUB_OUTPUT
+          echo "owner=$(echo '${{ github.repository_owner }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
       - name: Build and push
         uses: docker/build-push-action@v5
         with:
           context: .
           push: true
           tags: |
-            ghcr.io/${{ github.repository_owner }}/modelmesh:${{ steps.version.outputs.tag }}
-            ghcr.io/${{ github.repository_owner }}/modelmesh:latest
+            ghcr.io/${{ steps.meta.outputs.owner }}/modelmesh:${{ steps.meta.outputs.tag }}
+            ghcr.io/${{ steps.meta.outputs.owner }}/modelmesh:latest
           cache-from: type=gha
           cache-to: type=gha,mode=max