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ARG RUBY_VERSION
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FROM ruby:${RUBY_VERSION}
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LABEL org.opencontainers.image.authors="hanjo@bunix.de"
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ENV DEV_PACKAGES="build-base libffi-dev"
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RUN apk add --no-cache ${DEV_PACKAGES}
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ARG JEKYLL_VERSION
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RUN gem install jekyll -v ${JEKYLL_VERSION} --no-document \
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&& gem install jekyll-paginate --no-document \
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&& gem install jekyll-auto-image --no-document \
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&& gem install jekyll-tidy --no-document \
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&& gem install jekyll-sitemap --no-document \
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&& gem install jekyll-copyr --no-document \
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&& gem install bigdecimal --no-document \
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&& gem install kramdown-parser-gfm --no-document \
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&& gem install webrick --no-document
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RUN apk del ${DEV_PACKAGES} \
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&& rm -rf /var/cache/apk/*
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