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Dockerfile
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# in case we ever do any installs
# lets make them non-interactive
ARG DEBIAN_FRONTEND=noninteractive
###### stage 1 - build image with dependencies
# use existing haskell image as our base
FROM fpco/stack-build:lts-16.23 as base-compile-image
WORKDIR /opt/github-get
RUN stack update
# copy the yaml and cabal files
COPY ./github-get.cabal /opt/github-get
COPY ./stack.yaml /opt/github-get
# Docker will cache this command as a layer, savinf us the trouble or rebuilding
# dependencies unless we change fioles above.
RUN stack build --only-dependencies -j4
##### stage 2 - compile the code
FROM base-compile-image as compile-image
COPY . /opt/github-get
# do the build
RUN stack build --system-ghc
##### stage 3 - build small production image
FROM ubuntu:18.04 as runtime-image
ARG DEBIAN_FRONTEND=noninteractive
RUN echo "building runtime-image" && \
apt-get update && \
apt-get install -y libssl1.0.0 && \
apt-get install -y netbase && \
apt-get install -y ca-certificates
RUN mkdir -p /opt/github-get
WORKDIR /opt/github-get
ENTRYPOINT ["/opt/github-get/github-get-exe"]
COPY --from=compile-image /opt/github-get/.stack-work/dist/x86_64-linux/Cabal-3.0.1.0/build/github-get-exe/github-get-exe .
CMD [""]