Add PR Github Action

This Action builds and test the project without actually publishing anything when a PR is opened against master. 

A different action, that is triggered upon a commit to master, will actually deal with generating javadoc, documentation changes + publishing to MavenCentral.

Author: TomGranot

.github/workflows/maven.yml

@@ -0,0 +1,20 @@
+# This workflow is designed to build PRs for AHC. Note that it does not actually publish AHC, just builds and test it.
+# Docs: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: Java CI with Maven - PR Action
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-16.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build and test with Maven
+      run: mvn test -Ptest-output