Add .github/workflows/build.yml (opensearch-project#19)

* Add .github/workflows/build.yml

* Update build workflow order

Signed-off-by: Mital Awachat <mitalawachat@users.noreply.github.com>

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - "*"
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up JDK 14
+        uses: actions/setup-java@v2
+        with:
+          java-version: '14'
+          distribution: 'adopt'
+      - name: Checkout OpenSearch
+        uses: actions/checkout@v2
+        with:
+          repository: 'opensearch-project/OpenSearch'
+          path: OpenSearch
+          ref: '1.0.0'
+      - name: Build OpenSearch
+        working-directory: ./OpenSearch
+        run: ./gradlew publishToMavenLocal
+      - name: Checkout Branch
+        uses: actions/checkout@v2
+      - name: Build with Gradle
+        run: ./gradlew build