Add github action.

Author: jericks

.github/workflows/build.yml

@@ -0,0 +1,27 @@
+name: Maven Build
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build with Maven
+        run: mvn -B package --file pom.xml
+      - name: Upload geoscript-js.zip
+        uses: actions/upload-artifact@v2
+        with:
+          name: geoscript-js.zip
+          path: target/geoscript-js-*.zip
+      - name: Upload geoscript-js-app.jar
+        uses: actions/upload-artifact@v2
+        with:
+          name: geoscript-js-app
+          path: target/geoscript-js-*-app.jar

README.md

@@ -1,5 +1,7 @@
 [![Current Status](https://secure.travis-ci.org/geoscript/geoscript-js.png?branch=master)](https://travis-ci.org/geoscript/geoscript-js)
 
+[![Build Status](https://github.com/geoscript/geoscript-js/workflows/Maven%20Build/badge.svg)](https://github.com/geoscript/geoscript-js/actions)
+
 # geoscript.js
 
 ## GeoScript in JavaScript