docker/Dockerfile from m4i/cloudwatch-metrics-linux

docker/Dockerfile

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FROM ruby:2.4-alpine

RUN set -eux \
    && apk add --no-cache \
        openssl \
    # dumb-init
    && VERSION=1.2.0 \
    && wget -O /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v$VERSION/dumb-init_${VERSION}_amd64 \
    && chmod +x /usr/local/bin/dumb-init

ENTRYPOINT ["dumb-init", "cloudwatch-metrics-linux"]
WORKDIR /app

COPY Gemfile Gemfile.lock /app/
RUN bundle install -j4 --frozen