setup github action

.github/workflows/ci.yaml

@@ -0,0 +1,23 @@
+name: flow.ci
+
+on:
+  push:
+    branches:
+      - feature/*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git Clone
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'corretto'
+          cache: maven
+
+      - name: Build with Maven
+        run: ./mvnw test