test-runner/run-tests/action.yml

name: Cargo 3DS Test
description: >
  Run `cargo 3ds test` executables using Citra. Note that to use this action,
  you must use a container image of `devkitpro/devkitarm` and mount
  `/var/run/docker.sock:/var/run/docker.sock` into the container so that the
  runner image can be built by the action.  

inputs:
  args:
    description: Extra arguments to pass to `cargo 3ds test`
    required: false
    default: ''

  runner-image:
    description: The name of the container image to build for running tests in
    required: false
    default: test-runner-3ds

  working-directory:
    description: Change to this directory before running tests. Defaults to $GITHUB_WORKSPACE
    required: false
    default: ${GITHUB_WORKSPACE}

runs:
  using: composite
  steps:
    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v3

    - name: Build test-runner image
      uses: docker/build-push-action@v4
      with:
        context: ${{ github.action_path }}
        tags: ${{ inputs.runner-image }}:latest
        push: false
        load: true
        cache-from: type=gha
        cache-to: type=gha,mode=max

    - name: Ensure docker is installed in the container
      shell: bash
      run: apt-get update -y && apt-get install docker.io -y

    - name: Run cargo 3ds test
      shell: bash
      # Set a custom runner for `cargo test` commands to use.
      # Use ${GITHUB_WORKSPACE} due to
      # https://github.com/actions/runner/issues/2058, which also means
      # we have to export this instead of using the env: key
      run: |
        cd ${{ inputs.working-directory }}
        export CARGO_TARGET_ARMV6K_NINTENDO_3DS_RUNNER="
            docker run --rm
                -v ${{ runner.temp }}:${{ runner.temp }}
                -v ${{ github.workspace }}/target:/app/target
                -v ${{ github.workspace }}:${GITHUB_WORKSPACE}
                ${{ inputs.runner-image }}:latest"
        env
        cargo 3ds -v test ${{ inputs.args }}        
      env:
        # Ensure that doctests get built into a path which is mounted on the host
        # as well as in this container (via the bind mount in the RUNNER command)
        TMPDIR: ${{ runner.temp }}