Add build workflow

Author: valeriansaliou

.github/workflows/build.yml

@@ -0,0 +1,28 @@
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+name: Build and Release
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install NodeJS
+        uses: actions/setup-node@v1
+        with:
+          node-version: 16.x
+          registry-url: https://registry.npmjs.org
+
+      - name: Verify versions
+        run: node --version && npm --version && node -p process.versions.v8
+
+      - name: Release package
+        run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

README.md

@@ -1,6 +1,6 @@
 # js-safe-expression
 
-[![NPM](https://img.shields.io/npm/v/safe-expression.svg)](https://www.npmjs.com/package/safe-expression) [![Downloads](https://img.shields.io/npm/dt/safe-expression.svg)](https://www.npmjs.com/package/safe-expression) 
+[![Test and Build](https://github.com/crisp-oss/js-safe-expression/workflows/Test%20and%20Build/badge.svg?branch=master)](https://github.com/crisp-oss/js-safe-expression/actions?query=workflow%3A%22Test+and+Build%22) [![Build and Release](https://github.com/crisp-oss/js-safe-expression/workflows/Build%20and%20Release/badge.svg)](https://github.com/crisp-oss/js-safe-expression/actions?query=workflow%3A%22Build+and+Release%22) [![NPM](https://img.shields.io/npm/v/safe-expression.svg)](https://www.npmjs.com/package/safe-expression) [![Downloads](https://img.shields.io/npm/dt/safe-expression.svg)](https://www.npmjs.com/package/safe-expression)
 
 A lightweight, CSP-safe and fast javascript expression parser/executor. The main usage for this project is to execute javascript code without using eval or Function. It is built on the top of the AngularJS 1 internal lexer/parser. It compiles & executes javascript strings using a provided scope such as `"1+1"` or `"context.call_a_function()"`, `"value = 'foo"`, `"value === 'foo'"`