Add Skyscrapers actions-runner image per skyscrapers/platform#1135 (#48)

.github/workflows/publish-actions-runner-image.yml

@@ -0,0 +1,33 @@
+name: Publish Actions Runner Image
+
+on:
+  push:
+    branches:
+      - master
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}/actions-runner
+
+jobs:
+  build-latest:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push the container to GitHub Container Registry using the latest tag
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          platforms: linux/arm64
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+          push: true

README.md

@@ -6,6 +6,13 @@ Docker images. Each folder contains the setup for a single image.
 The Concourse pipeline to build all images can be found in the
 [skyscrapers/ci](https://github.com/skyscrapers/ci) repository.
 
+## actions-runner
+
+This is a Docker image based on the official GitHub Actions runner image. It is used to run GitHub Actions on a self-hosted runner in a Kubernetes cluster.
+Our layer adds our most used tools onto the official image.
+
+The image is build with GitHub actions and pushed to the `ghcr.io/skyscrapers/actions-runner` repository.
+
 ## packer g10k
 
 This is a Docker image containing the following tools:

actions-runner/Dockerfile

@@ -0,0 +1,17 @@
+FROM mcr.microsoft.com/dotnet/runtime-deps:6.0-jammy as build
+RUN apt-get update -y \
+  && apt-get install -y \
+  jq \
+  git \
+  curl \
+  unzip \
+  zip
+
+FROM ghcr.io/actions/actions-runner:latest
+
+COPY --from=build /usr/bin/jq /usr/bin/jq
+COPY --from=build /usr/bin/git /usr/bin/git
+COPY --from=build /usr/bin/curl /usr/bin/curl
+COPY --from=build /usr/bin/unzip /usr/bin/unzip
+COPY --from=build /usr/bin/zip /usr/bin/zip
+COPY --from=build /usr/lib/ /usr/lib/