Deployment of NX.Explorer to fly.io

Phoenix Forum Questions / Help
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Hi @Nefcairon,

I was working through this problem yesterday as well.

In the end, I installed nodejs and npm packages on the BUILDER image, changed the order of the COPY commands and added npm install.

The NODE_ENV=production npx tailwindcss --postcss --minify -i css/app.css -o ../priv/static/assets/app.css && cd .. call is in your package.json file so it will be called when you call mix assets.deploy.

My final Dockerfile looks like this:

ARG BUILDER_IMAGE="hexpm/elixir:1.12.3-erlang-24.1.4-debian-bullseye-20210902-slim"
ARG RUNNER_IMAGE="debian:bullseye-20210902-slim"

FROM ${BUILDER_IMAGE} as builder

# install build dependencies
RUN apt-get update -y && apt-get install -y build-essential git nodejs npm \
    && apt-get clean && rm -f /var/lib/apt/lists/*_*

# prepare build dir
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# set build ENV
ENV MIX_ENV="prod"

# install mix dependencies
COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile

# Compile the release
COPY lib lib

COPY priv priv

COPY assets assets

RUN cd assets && npm install

RUN mix assets.deploy

RUN mix compile

# Changes to config/runtime.exs don't require recompiling the code
COPY config/runtime.exs config/

COPY rel rel
RUN mix release

# start a new build stage so that the final image will only contain
# the compiled release and other runtime necessities
FROM ${RUNNER_IMAGE}

RUN apt-get update -y && apt-get install -y libstdc++6 openssl libncurses5 locales \
  && apt-get clean && rm -f /var/lib/apt/lists/*_*

# Set the locale
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen

ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8

WORKDIR "/app"
RUN chown nobody /app

# Only copy the final release from the build stage
COPY --from=builder --chown=nobody:root /app/_build/prod/rel ./

USER nobody

# Create a symlink to the application directory by extracting the directory name. This is required
# since the release directory will be named after the application, and we don't know that name.
RUN set -eux; \
  ln -nfs /app/$(basename *)/bin/$(basename *) /app/entry

CMD /app/entry start
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