Added automated build and test infrastructure

Based on docker and github actions
Builds a docker image for each commit as well as the lua lib mod
Builds the master branch of subspace_storage for use with the tests
Tests are based on latest stable factorio branch

.github/workflows/docker-publish.yml

@@ -0,0 +1,159 @@
+name: Docker
+
+on:
+  push:
+    # Publish `master` as Docker `latest` image.
+    branches:
+      - master
+
+    # Publish `v1.2.3` tags as releases.
+    tags:
+      - v*
+
+  # Run tests for any PRs.
+  pull_request:
+
+  release:
+    types: [released, prereleased]
+
+env:
+  # TODO: Change variable to your image's name.
+  IMAGE_NAME: clusterio
+
+jobs:
+  # Build dependencies and clusterio image
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build docker image
+        run: DOCKER_BUILDKIT=1 docker build . -t $IMAGE_NAME --target clusterio_final
+
+      - name: Export docker image
+        run: docker save -o clusterio_docker_image $IMAGE_NAME
+
+      - name: Upload docker image
+        uses: actions/upload-artifact@master
+        with:
+          name: clusterio_docker_image
+          path: clusterio_docker_image
+  # Build dependencies and clusterio image with test tooling
+  build_testing:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build docker image
+        run: DOCKER_BUILDKIT=1 docker build . -t $IMAGE_NAME --target clusterio_testing
+
+      - name: Export docker image
+        run: docker save -o clusterio_docker_image_testing $IMAGE_NAME
+
+      - name: Upload docker image
+        uses: actions/upload-artifact@master
+        with:
+          name: clusterio_docker_image_testing
+          path: clusterio_docker_image_testing
+  # Upload clusterio_lib and subspace_storage versions
+  upload_mods:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download docker image
+        uses: actions/download-artifact@master
+        with:
+          name: clusterio_docker_image
+          path: .
+
+      - name: Load docker image
+        run: docker load -i clusterio_docker_image
+      
+      - name: Create container
+        run: docker create --name clusterio_container $IMAGE_NAME
+
+      - name: Move mods out of container
+        run: docker cp clusterio_container:/clusterio/sharedMods ./mods
+
+      - name: Remove container
+        run: docker rm clusterio_container
+
+      - name: List extracted mods
+        run: ls mods
+
+      - name: Upload mods
+        uses: actions/upload-artifact@master
+        with:
+          name: mods
+          path: mods
+  # Run tests.
+  # See also https://docs.docker.com/docker-hub/builds/automated-testing/
+  test:
+    needs: build_testing
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Download docker image
+        uses: actions/download-artifact@master
+        with:
+          name: clusterio_docker_image_testing
+          path: .
+      - name: ls
+        run: ls && ls clusterio_docker_image_testing && ls /home/runner/work/factorioClusterio && ls /home/runner/work/factorioClusterio/factorioClusterio
+      - name: Load docker image
+        run: docker load -i clusterio_docker_image_testing
+
+      - name: Run tests
+        run: |
+          if [ -f docker-compose.test.yml ]; then
+            docker-compose --file docker-compose.test.yml run unit_test
+          else
+            docker build . --file Dockerfile
+          fi
+  # Push image to GitHub Packages.
+  # See also https://docs.docker.com/docker-hub/builds/
+  push:
+    # Ensure test job passes before pushing image.
+    needs: [test, build]
+
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Download artifact
+        uses: actions/download-artifact@master
+        with:
+          name: clusterio_docker_image
+          path: .
+
+      - name: Load docker image
+        run: docker load -i clusterio_docker_image
+
+      - name: Log into registry
+        run: echo "${{ secrets.CR_PAT }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Push image
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.actor }}/$IMAGE_NAME
+
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "master" ] && VERSION=latest
+
+          echo IMAGE_ID=$IMAGE_ID
+          echo VERSION=$VERSION
+
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION