feat(release): setup for publishing docker images to ghcr

.github/workflows/ci.yml

@@ -28,6 +28,14 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/v')
     steps:
       - uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Docker Login
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - uses: actions/setup-go@v2
         with:
           go-version: 1.16