ci: fix bad repo name when publishing container

.github/workflows/release-containers.yaml

@@ -43,11 +43,19 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      # This is needed because the repo is under the "Glistix" - not "glistix" - org,
+      # and lowercase repo names are required for the registry.
+      # See https://github.com/orgs/community/discussions/25768
+      - name: Convert repository name to lowercase
+        env:
+          ORIGINAL_GH_REPO: ${{ github.repository }}
+        run: |
+          echo "GH_REPO=${ORIGINAL_GH_REPO,,}" >>${GITHUB_ENV}
+
       - name: Build version and tags
         id: versions
         env:
           GH_REF: ${{ github.ref }}
-          GH_REPO: ${{ github.repository }}
         run: |
           # Strip git ref prefix from version
           V_VERSION=$(echo "$GH_REF" | sed -e 's|.*/\(.*\)|\1|')
@@ -67,8 +75,6 @@ jobs:
           echo "container_tag=$TAG" >> $GITHUB_OUTPUT
 
       - name: Download Glistix archives from GitHub release
-        env:
-          GH_REPO: ${{ github.repository }}
         run: |
           VERSION=${{ steps.versions.outputs.v_version }}