Dockerfile

# STEP 1: Use an official Elixir runtime as a parent image
FROM hexpm/elixir:1.14.4-erlang-25.3.2-alpine-3.16.5 AS builder

# install git
RUN apk add --no-cache git

# Install hex and rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# Initialize a new application
RUN mkdir /app
RUN mkdir /dist

WORKDIR /app

# Set the MIX environment
ENV MIX_ENV=prod

# The order of the following commands is important.
# It ensures that:
# * any changes in the `lib` directory will only trigger videoroom compilation
# * any changes in the `config` directory will trigger both videoroom
# and deps compilation but not deps fetching
# * any changes in the `config/runtime.exs` won't trigger anything
COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV

COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile

COPY lib lib
RUN mix compile

COPY config/runtime.exs config/

# Build a release and list the contents of the release directory
RUN mix release --overwrite --path /dist


# STEP 2: Use an official Erlang runtime as a parent image for the runtime environment
FROM hexpm/elixir:1.14.4-erlang-25.3.2-alpine-3.16.5

# Install openssl
RUN apk add --no-cache openssl ncurses-libs

# Set the PORT
ENV BE_PORT=5004

# Create an environment variable with the directory where the app is going to be installed
ENV APP_HOME=/opt/app 

# Create the application directory 
RUN mkdir "$APP_HOME"

# Copy over the build artifact from step #1 and set correct permissions
COPY --from=builder /dist "$APP_HOME"
WORKDIR "$APP_HOME"

# Expose relevant ports for the application
EXPOSE 5004

# keep the release running

CMD ["./bin/videoroom", "start"]