Create image and attempt CI

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: rubixcubin/scala-graal-builder:latest

Dockerfile

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+FROM debian:11-slim
+
+# Artifact information
+ARG sdkmanGraalJavaVersion="22.0.0.2.r17-grl"
+
+# User information
+ARG username="builder"
+ARG useruid=1000
+ARG groupid=1000
+ARG groupname="buildergroup"
+ARG home="/home/$username"
+
+SHELL ["/bin/bash", "-c"]
+
+# Add a non-root user and specify dependencies needed for SDKMAN and GraalVM native image
+RUN groupadd -g $groupid $username && \
+	useradd -m -g $groupid -u $useruid $username && \
+    apt-get update && \
+    apt-get install -y curl zip build-essential libz-dev zlib1g-dev
+
+# Switch to the user
+USER $useruid:$groupid
+
+# Install SDKMAN
+RUN curl -s "https://get.sdkman.io" | bash && \
+    source $home/.sdkman/bin/sdkman-init.sh && \
+    sdk install java $sdkmanGraalJavaVersion && \
+    sdk install sbt && \
+    gu install native-image

README.md

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+# A Docker image to build Scala & Graal Native Image projects
+
+This image relies on SDKMAN to provide the following:
+* The latest version of SBT at the time of building
+* A GraalVM CE flavour of the JVM (currently `22.0.0.2.r17`)
+* Graal Native Image to build native image binaries.
+
+
+## Building locally
+
+1. `docker build -t rubixcubin/scala-graal-builder:local .`
+2. `docker run -it rubixcubin/scala-graal-builder:local bash`
+
+
+## Recommended usage
+You can use a multi-stage build if you want to use this image to build your project
+and leverage the artifacts produced by the build in a smaller image to package and serve your application.
+
+For example, for a native-image build:
+```Dockerfile
+# Step 1: Use this image to build your project
+FROM rubixcubin/scala-graal-builder:latest as builder
+COPY . /build
+WORKDIR /build
+
+# This generates the binary that represents your application
+RUN sbt graalvm-native-image:packageBin
+
+# This is what you want to use to package and run your application
+FROM gcr.io/distroless/base
+COPY --from=builder /build/your-project/target/graalvm-native-image /app
+CMD ["/app/your-app"]
+```