add github ci

Author: alexcheng1982

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+ko_fi: alexcheng1982
+github: alexcheng1982

.github/workflows/build.yaml

@@ -0,0 +1,22 @@
+name: build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: "21"
+          distribution: "temurin"
+          cache: maven
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots package