add github actions

.github/workflows/release-by-push-tag.yml

@@ -0,0 +1,42 @@
+name: release by push tag
+on:
+  push:
+    tags:
+      - '*'
+  workflow_dispatch:
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: checkout with node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+
+      - name: Get version
+        id: get-version
+        run: echo ::set-output name=VERSION::${GITHUB_REF#refs/tags/}
+
+      - name: Get commit summary
+        id: get-commit-summary
+        run: |
+          PREVIOUS_TAG=$(git tag --sort=-creatordate | sed -n 2p)
+          echo "PREVIOUS_TAG: $PREVIOUS_TAG"
+          COMMIT_SUMMARY="$(git log --oneline --pretty=tformat:"%h %s" $PREVIOUS_TAG..${{ github.ref }})"
+          COMMIT_SUMMARY="${COMMIT_SUMMARY//$'\n'/'%0A'}"
+          echo ::set-output name=COMMIT_SUMMARY::$COMMIT_SUMMARY
+
+      - name: Create release
+        id: create-release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          body: |
+            ${{ steps.get-commit-summary.outputs.COMMIT_SUMMARY }}
+          draft: false
+          prerelease: false