Add GitHub action to build GitWave.zip

Author: introfog

.github/workflows/maven.yml

@@ -0,0 +1,37 @@
+name: Build and Package
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest] 
+        java-version: [11]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up JDK
+      uses: actions/setup-java@v2
+      with:
+        java-version: ${{ matrix.java-version }}
+        distribution: 'adopt'
+
+    - name: Build with Maven
+      run: mvn package
+
+    - name: Upload Artifact
+      if: success()
+      uses: actions/upload-artifact@v2
+      with:
+        name: GitWave.zip
+        path: target/GitWave.zip