fix syntax yet again

Author: jkarneges

.github/workflows/docker-publish.yml

@@ -38,8 +38,8 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
-          build-args:
-            VERSION: ${{ env.SOURCE_VERSION }}
+          build-args: |
+            VERSION=${{ env.SOURCE_VERSION }}
           platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}