add metadata to Dockerfile
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FROM ruby:2.3.1-alpine
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LABEL maintainer="https://github.com/tootsuite/mastodon" \
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description="A GNU Social-compatible microblogging server"
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ENV RAILS_ENV=production \
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NODE_ENV=production
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EXPOSE 3000 4000
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WORKDIR /mastodon
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COPY Gemfile Gemfile.lock package.json yarn.lock /mastodon/
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