fix: correct syntax for GITHUB_REF_NAME variable in Docker metadata extraction

Signed-off-by: Stephen Simpson <ssimpson89@users.noreply.github.com>

.gitea/workflows/docker-image-linux.yml

@@ -42,7 +42,7 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/${{ vars.USERNAME }}/${{ env.IMAGE_NAME }}
           tags: |
-            {{ env.env.GITHUB_REF_NAME }}
+            ${{ env.env.GITHUB_REF_NAME }}
             
       - name: Build and push both architectures
         uses: docker/build-push-action@v6