Initializing gradle build workflows

.gitea/workflows/gradle_build.yml

@@ -0,0 +1,24 @@
+name: sample gradle build and test
+run-name: Build started by $ {{gitea.actor }}
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: JDK setup
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: '21'
+      - name: Validate Gradle Wrapper
+        uses: gradle/actions/wrapper-validation@v3
+      - name: Gradle build
+        run: ./greadlew build -i
+