Add gitea action build pipeline

.gitea/workflows/build.yaml

@@ -0,0 +1,30 @@
+name: Build and Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+          cache: maven
+
+      - name: Test and package
+        run: mvn -B verify
+
+      - name: Upload jar
+        uses: actions/upload-artifact@v3
+        with:
+          name: package
+          path: target/*.jar