Add github actions (#345)

Author: niloc132

.github/workflows/build.yml

@@ -0,0 +1,26 @@
+name: Build GWT Site
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Java 11
+        uses: actions/setup-java@v4
+        with:
+          java-version: 11
+          distribution: 'temurin'
+          cache: 'maven'
+      - name: Build with Maven
+        run: mvn -e --batch-mode --no-transfer-progress verify -Pgrunt
+
+      - name: Upload artifact for testing/deployment
+        uses: actions/upload-artifact@v3
+        with:
+          name: gwt-site
+          path: 'target/generated-site/'