Add GitHub actions workflow for publishing kpt-functions to NPM registry. (#57)

* Add GitHub actions workflow for publishing kpt-functions to registry.

Author: frankfarzan

.github/workflows/ci.yaml

@@ -1,8 +1,6 @@
 name: CI
 
 on:
-  # Trigger the workflow on push or pull request,
-  # but only for the master branch
   push:
     branches:
       - master

.github/workflows/release-kpt-functions.yaml

@@ -0,0 +1,28 @@
+name: release-kpt-functions
+
+on:
+  push:
+    tags:
+      - release-kpt-functions-*
+
+jobs:
+  node-ci:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js 12.x
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+        registry-url: 'https://npm.pkg.github.com'
+    - name: Install, test
+      run: |
+        cd ts/kpt-functions
+        npm ci
+        npm test
+    - name: Publish
+      run: |
+        cd ts/kpt-functions
+        ../../scripts/publish-npm.sh $GITHUB_REF
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

scripts/publish-npm.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euo pipefail
+
+TAG_VERSION=${1#*-v};
+echo "tag version: $TAG_VERSION"
+
+PACKAGE_VERSION=$(node -p "require('./package.json').version")
+echo "package version: $PACKAGE_VERSION"
+
+if [[ "$PACKAGE_VERSION" != "$TAG_VERSION" ]]; then
+      echo "package version does not match the tag"
+      exit 1
+fi
+
+
+if [[ "$PACKAGE_VERSION" == *"rc"* ]]; then
+      npm publish --tag rc
+else
+      npm publish
+fi