Enable GitHub Actions (#363)

Signed-off-by: Sheng Chen <[email protected]>

Author: jdneo

.github/workflows/build.yml

@@ -0,0 +1,91 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  linux:
+    name: Linux
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up JDK 11
+      uses: actions/setup-java@v1
+      with:
+        java-version: '11'
+
+    - name: Cache local Maven repository
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+
+    - name: Verify
+      run: ./mvnw clean verify
+
+    - name: Checkstyle
+      run: ./mvnw checkstyle:check
+
+  windows:
+    name: Windows
+    runs-on: windows-latest
+    timeout-minutes: 30
+    steps:
+    - name: Set git to use LF
+      run: |
+        git config --global core.autocrlf false
+        git config --global core.eol lf
+
+    - uses: actions/checkout@v2
+
+    - name: Set up JDK 11
+      uses: actions/setup-java@v1
+      with:
+        java-version: '11'
+
+    - name: Cache local Maven repository
+      uses: actions/cache@v2
+      with:
+        path: $HOME/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+
+    - name: Verify
+      run: ./mvnw.cmd clean verify
+
+    - name: Checkstyle
+      run: ./mvnw.cmd checkstyle:check
+
+  darwin:
+    name: macOS
+    runs-on: macos-latest
+    timeout-minutes: 30
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up JDK 11
+      uses: actions/setup-java@v1
+      with:
+        java-version: '11'
+
+    - name: Cache local Maven repository
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+
+    - name: Verify
+      run: ./mvnw clean verify
+
+    - name: Checkstyle
+      run: ./mvnw checkstyle:check