Dockerfile

#
# Scala and sbt Dockerfile
#
# https://github.com/sbt/docker-sbt
#

# Pull base image
ARG BASE_IMAGE_TAG
FROM ghcr.io/graalvm/graalvm-community:${BASE_IMAGE_TAG:-21}

# Set the workdir
WORKDIR /app

# Env variables
ARG SCALA_VERSION
ENV SCALA_VERSION ${SCALA_VERSION:-2.13.13}
ARG SBT_VERSION
ENV SBT_VERSION ${SBT_VERSION:-1.9.8}
ENV JAVA_OPTS -XX:+UseG1GC

# Install sbt
RUN \
  curl -fsL "https://github.com/sbt/sbt/releases/download/v$SBT_VERSION/sbt-$SBT_VERSION.tgz" | tar xfz - -C /usr/share && \
  chown -R root:root /usr/share/sbt && \
  chmod -R 755 /usr/share/sbt && \
  ln -s /usr/share/sbt/bin/sbt /usr/local/bin/sbt

# Install Scala
RUN \
  case $SCALA_VERSION in \
    "3"*) URL=https://github.com/lampepfl/dotty/releases/download/$SCALA_VERSION/scala3-$SCALA_VERSION.tar.gz SCALA_DIR=/usr/share/scala3-$SCALA_VERSION ;; \
    *) URL=https://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz SCALA_DIR=/usr/share/scala-$SCALA_VERSION ;; \
  esac && \
  curl -fsL $URL | tar xfz - -C /usr/share && \
  mv $SCALA_DIR /usr/share/scala && \
  chown -R root:root /usr/share/scala && \
  chmod -R 755 /usr/share/scala && \
  ln -s /usr/share/scala/bin/* /usr/local/bin && \
  case $SCALA_VERSION in \
    "3"*) echo '@main def main = println(s"Scala library version ${dotty.tools.dotc.config.Properties.versionNumberString}")' > test.scala ;; \
    *) echo "println(util.Properties.versionMsg)" > test.scala ;; \
  esac && \
  scala -nocompdaemon test.scala && rm test.scala

# Prepare sbt (warm cache)
RUN \
  sbt sbtVersion && \
  mkdir -p project && \
  echo "scalaVersion := \"${SCALA_VERSION}\"" > build.sbt && \
  echo "sbt.version=${SBT_VERSION}" > project/build.properties && \
  echo "// force sbt compiler-bridge download" > project/Dependencies.scala && \
  echo "case object Temp" > Temp.scala && \
  sbt compile && \
  rm -r project && rm build.sbt && rm Temp.scala && rm -r target

# Copy project files
COPY . . 

# Expose necessary port
EXPOSE 9000

# Launch the project
CMD [ "sbt", "run" ]