Add CD workflow

.github/workflows/cd.yml

@@ -0,0 +1,34 @@
+name: Continuous Delivery
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  cd:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.14.x
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v1
+        with:
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_API_TOKEN}}
+      - name: Get tag
+        id: tag
+        run: echo "::set-output name=tag::${GITHUB_REF##*/}"
+      - name: Bump Homebrew formula
+        uses: dawidd6/action-homebrew-bump-formula@v1
+        with:
+          token: ${{secrets.GITHUB_API_TOKEN}}
+          formula: lazygit
+          url: "https://github.com/${{github.repository}}/archive/${{steps.tag.outputs.tag}}.tar.gz"