Add github actions.

Signed-off-by: Nicolas Graf <[email protected]>

.github/workflows/docker-publish.yml

@@ -0,0 +1,55 @@
+name: Docker Publish
+on:
+  release:
+    types: [published]
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'release'
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Prepare
+        id: prep
+        run: |
+          DOCKER_IMAGE=evoesports/armagetronad
+          VERSION=${GITHUB_REF#refs/tags/}
+          TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:latest"
+          echo ::set-output name=tags::${TAGS}
+          echo ::set-output name=version::${VERSION}
+          echo ::set-output name=builddate::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+          echo ::set-output name=revision::$(git rev-parse --short HEAD)
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v2 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64,linux/386,linux/arm64/v8,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: ${{ steps.prep.outputs.tags }}
+          build-args: |
+            VERSION=${{ steps.prep.outputs.version }}
+            BUILD_DATE=${{ steps.prep.outputs.builddate }}
+            REVISION=${{ steps.prep.outputs.revision }}
+      -
+        name: Docker Hub Description
+        uses: peter-evans/dockerhub-description@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          repository: evoesports/armagetronad