Dockerfile

# syntax=docker/dockerfile:1

# The eclipse-temurin image and the standard openJDK11 fails to run on M1 Macs because it is incompatible with ARM architecture. This
# workaround uses an aarch64 (arm64) image instead when an optional platform argument is set to arm64.
# Docker's BuildKit skips unused stages so the image for the platform that isn't used will not be built.

FROM eclipse-temurin:11.0.16_8-jdk-alpine as amd64
FROM bellsoft/liberica-openjdk-alpine:11.0.16-8 as arm64

FROM ${TARGETARCH}

ENV SBT_VERSION "1.6.2"
ENV INSTALL_DIR /usr/local
ENV SBT_HOME /usr/local/sbt
ENV PATH "${PATH}:${SBT_HOME}/bin"
ENV SBT_URL "https://github.com/sbt/sbt/releases/download/v${SBT_VERSION}/sbt-${SBT_VERSION}.tgz"

ENV PROJECT_HOME /usr/src
ENV PROJECT_NAME server
ENV PROJECT_LOC "${PROJECT_HOME}/${PROJECT_NAME}"


########################################################
### First, add dependancies that don't often change. ###
########################################################

# Update and add system dependancies
RUN set -o pipefail && \
  apk update && \
  apk add --upgrade apk-tools && \
  apk upgrade --available && \
  apk add --no-cache --update openjdk11 bash wget npm git openssh ncurses

# Install npm (node)
RUN npm install -g npm@8.5.1

# Download sbt
RUN set -o pipefail && \
  mkdir -p "${SBT_HOME}" && \
  wget -qO - "${SBT_URL}" | tar xz -C "${INSTALL_DIR}" && \
  echo -ne "- with sbt ${SBT_VERSION}\n" >> /root/.built

# Make the project dir and install sbt
# (cannot do it in root dir)
RUN mkdir -p "${PROJECT_LOC}"
WORKDIR "${PROJECT_LOC}"

# SBT downloads a lot at run-time.
RUN sbt update

########################################################
### Install dependancies and build the server,       ###
### In order of how frequently the files change      ###
########################################################

# Copy the node package files (package.json and package-lock.json)
# and save them to the npm cache.
# Do this before the rest of the server code, so they don't
# get re-downloaded every time code changes.
COPY "${PROJECT_NAME}"/package* .
RUN npm install

# Copy over the remainder of the server code
# Everything below here is re-run whenever any file changes.
COPY "${PROJECT_NAME}" "${PROJECT_LOC}"

# We need to save the build assets to a seperate directory (pushRemoteCache)
RUN sbt update compile pushRemoteCache -Dconfig.file=conf/application.dev.conf

########################################################
### Get the volumes and startup commands set up       ###
########################################################

COPY entrypoint.sh /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]

# Save build results to anonymous volumes for reuse
# We do this first, so they don't get shadowed by the
# local server directory when running locally.
VOLUME [ "/usr/src/server/target","/usr/src/server/project/project", "/usr/src/server/project/target", "/usr/src/server/node_modules", "/usr/src/server/.bsp/","/usr/src/server/public/stylesheets/" ]
# Then map the server code to a volume, which can be shadowed
# locally.
VOLUME ["/usr/src/server"]

EXPOSE 9000