diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 94f73ae..e1ac1e3 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -83,7 +83,7 @@ jobs:
             ${{ env.IMAGE_NAME }}
           # generate Docker tags based on the following events/attributes
           tags: |
-            type=raw,value={{branch}}-{{sha}},enable=${{ branch != '' }}
+            type=raw,value={{branch}}-{{sha}},enable={{#if branch}}true{{else}}false{{/if}}
             type=schedule,pattern=nightly
             type=schedule,pattern={{date 'YYYYMMDD'}}
             type=semver,pattern={{version}}