cleaner registry name and url one more time with debug

.gitea/workflows/build-container.yaml

@@ -32,6 +32,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Debug registry variables
+        run: |
+          echo "REGISTRY_HOST=${{ env.REGISTRY_HOST }}"
+          echo "REGISTRY_URL=${{ env.REGISTRY_URL }}"
+          echo "gitea.server_url=${{ gitea.server_url }}"
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
@@ -41,7 +47,7 @@ jobs:
       - name: Login to Gitea Container Registry
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.REGISTRY_HOST }}
+          registry: ${{ env.REGISTRY_URL }}
           username: ${{ gitea.actor }}
           password: ${{ secrets.CONTAINER_TOKEN }}