Add release action by pushed tag. (#4)

Author: vvuwei

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Release
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    env:
+      ACTIONS_ALLOW_UNSECURE_COMMANDS: true
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+
+      - name: Set up environment
+        run: echo ::set-env name=RELEASE_VERSION::${GITHUB_REF#refs/*/}
+
+      - name: Publish GitHub release
+        uses: "marvinpinto/action-automatic-releases@latest"
+        with:
+          repo_token: "${{ secrets.GITHUB_TOKEN }}"
+          prerelease: false