Initial test of Java CI compile and verify

Author: Foorack

.github/workflows/ci.yaml

@@ -0,0 +1,29 @@
+on: [push, pull_request]
+
+name: OpenAPI Java SDK CI
+
+jobs:
+  gradle-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 13
+        uses: actions/setup-java@v2
+        with:
+          java-version: '13'
+          distribution: 'adopt'
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
+      - name: Build with Gradle
+        run: ./gradlew build
+  maven-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 13
+        uses: actions/setup-java@v2
+        with:
+          java-version: '13'
+          distribution: 'adopt'
+      - name: Build with Maven
+        run: mvn --batch-mode verify