Node.js
docker
docker-compose

docker-cmpose buildでnode.jsのインストール時にエラー

gnupgが必要らしい

error
d -   && curl -sL https://deb.nodesource.com/setup_9.x | bash -   && apt-get update   && apt-get install -y nodejs
 ---> Running in 6c9ae273f351
E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation

Dockerfileに以下を追記

Dokerfile
RUN apt-get update \
  && apt-get install -my wget gnupg