First attempt at building arm64 docker images

.github/workflows/docker-image.yml

@@ -3,7 +3,7 @@ on: workflow_dispatch
 
 jobs:
 
-  build:
+  build-x64:
 
     runs-on: ubuntu-22.04
 
@@ -22,3 +22,27 @@ jobs:
         context: ./x64
         push: true
         tags: meshtastic/github-action-runner:latest
+
+  build-arm64:
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: docker/setup-qemu-action@v3
+      name: Set up QEMU
+
+    - name: Docker login
+      run:  docker login -u meshtastic -p ${{secrets.DOCKER_TOKEN}}
+
+    - name: Docker setup
+      uses: docker/setup-buildx-action@v3
+      platforms: linux/arm64
+
+    - name: Docker build and push
+      uses: docker/build-push-action@v6
+      platforms: linux/arm64
+      with:
+        context: ./arm64
+        push: true
+        tags: meshtastic/github-action-runner:latest

arm64/Dockerfile

@@ -0,0 +1,27 @@
+FROM debian:bookworm
+MAINTAINER Jonathan Bennett
+SHELL ["/bin/bash", "-c"]
+RUN <<EOF
+useradd ubuntu -m -s /bin/bash
+usermod -a -G sudo ubuntu
+apt update
+apt upgrade -y
+apt install curl pip git python3-venv pkg-config libicu-dev sudo podman zip jq wget -y
+sed -i /etc/sudoers -re 's/^%sudo.*/%sudo ALL=(ALL:ALL) NOPASSWD: ALL/g'
+ln -s /usr/bin/podman /usr/bin/docker
+EOF
+
+WORKDIR /home/ubuntu
+USER ubuntu
+
+RUN <<EOF
+cd /home/ubuntu
+mkdir runner
+latest_runner_version=$(curl -I -v -s https://github.com/actions/runner/releases/latest 2>&1 | perl -ne 'next unless s/^< location: //; s{.*/v}{}; s/\s+//; print')
+curl -sL "https://github.com/actions/runner/releases/download/v${latest_runner_version}/actions-runner-linux-arm64-${latest_runner_version}.tar.gz" | tar xzvC ./runner/
+sudo ./runner/bin/installdependencies.sh
+python3 -m venv ./
+source ./bin/activate
+pip install -U platformio adafruit-nrfutil
+pip install -U meshtastic --pre
+EOF