filter yq to just first document

.drone.yml

@@ -91,7 +91,7 @@ steps:
       - LATEST_VERSION=$(git tag --sort v:refname | grep '^v[0-9]\{1,\}\.[0-9]\{1,\}\.[0-9]\{1,\}$' | tail -n 1)
       - git checkout $LATEST_VERSION
       - printf $(git log -n 1 --pretty=%H) > ../commit_hash # we'll need this for the docker build
-      - GOLANG_IMG=$(yq eval '.steps[0].image' .drone.yml)
+      - GOLANG_IMG=$(yq eval 'select(documentIndex == 0) | .steps[0].image' .drone.yml)
       - docker pull $GOLANG_IMG
       - docker tag $GOLANG_IMG drone-builder:latest
       - docker image rm $GOLANG_IMG