Dockerfile: use multistage build to avoid shipping build tools
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FROM jekyll/minimal:3.8
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FROM ruby:3.2.2-alpine AS builder
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RUN apk update && apk add g++ make
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RUN mkdir -p /home
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COPY Gemfile /home
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COPY Gemfile.lock /home
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RUN chmod -R 777 /home
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WORKDIR /home
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RUN bundle install
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FROM ruby:3.2.2-alpine
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COPY --from=builder /usr/local/bundle /usr/local/bundle
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RUN mkdir -p /home
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WORKDIR /home
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CMD ["jekyll", "serve"]
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