ci: add action

.github/workflows/docker.yaml

@@ -0,0 +1,31 @@
+name: docker
+
+on:
+  push:
+    branches: 
+      - 'master'
+      - 'release'
+  release:
+    types:
+      - published
+
+jobs:
+  build-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ secrets.GHCR_USER }}
+          password: ${{ secrets.GHCR_PAT }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/${{ github.repository }}:${{ github.ref_name }}