Add GitHub actions (#3)

* create workflows folder

.github/workflows/docker-build.yml

@@ -0,0 +1,20 @@
+name: Build and publish Docker image
+
+on:
+  push:
+    branches:
+      - 'master'
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-push:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: valitydev/action-deploy-docker@v2
+        with:
+          registry-username: ${{ github.actor }}
+          registry-access-token: ${{ secrets.GITHUB_TOKEN }}
+          platforms: linux/amd64,linux/arm64