add metadata to Dockerfile
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		@@ -1,8 +1,13 @@
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FROM ruby:2.3.1-alpine
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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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					ENV RAILS_ENV=production \
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    NODE_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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					WORKDIR /mastodon
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COPY Gemfile Gemfile.lock package.json yarn.lock /mastodon/
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					COPY Gemfile Gemfile.lock package.json yarn.lock /mastodon/
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