Add release workflow

Author: jclem

.github/workflows/release.yml

@@ -0,0 +1,18 @@
+on: repository_dispatch
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v1.0.2
+        with: {go-version: '1.12.7'}
+      - uses: actions/checkout@v1.0.0
+      - run: go test ./...
+      - run: script/build
+      - uses: jclem/github-release@master
+        with:
+          tag-name: ${{github.event.action}}
+          name: ${{github.event.action}}
+          draft: true
+          assets: 'build/*.tar.gz'
+          github-token: ${{github.token}}