feat: add github workflows

.github/workflows/ci.yaml

@@ -0,0 +1,42 @@
+---
+name: ci
+on:
+  push:
+    branches: [ main ]
+    tags: [ v* ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  docker:
+    name: docker
+    runs-on: ubuntu-latest
+    needs:
+      - lint
+      - test
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/metadata-action@v3
+        id: meta
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+      - uses: docker/build-push-action@v2
+        with:
+          file: "Dockerfile"
+          context: .
+          platforms: linux/amd64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}