Add github-actions ci workflow

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  build:
+    runs-on: macos-11
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Read Go version
+      id: go-version
+      run: |
+        echo "::set-output name=content::$(cat .go-version)"
+
+    - name: Setup Go
+      uses: actions/setup-go@v2
+      with:
+        # TODO: Replace with go-version-from-file when it is supported
+        # https://github.com/actions/setup-go/pull/62
+        go-version: ${{ steps.go-version.outputs.content }}
+
+    - name: Build Snapshot
+      uses: goreleaser/goreleaser-action@v2
+      with:
+        version: latest
+        args: build --snapshot --rm-dist