ci: correct platforms field indentation in Docker workflow

- Fix indentation for the platforms field in the Docker workflow configuration

Signed-off-by: appleboy <[email protected]>

Author: appleboy

.github/workflows/docker.yml

@@ -69,8 +69,8 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          platforms: linux/amd64
           file: docker/Dockerfile
+          platforms: linux/amd64
           push: false
           load: true
           tags: drone-ssh:scan