test ci를 추가한다

.github/workflows/test.yaml

@@ -0,0 +1,28 @@
+name: Build & Unit Test
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set JDK to 17
+        uses: actions/setup-java@v3
+        with:
+          distribution: "temurin"
+          java-version: "17"
+          java-package: jdk
+          architecture: x64
+          cache: 'gradle'
+
+      - name: Build with Gradle
+        run: |
+          ./gradlew clean build
+
+      - name: Run Unit Tests
+        run: |
+          ./gradlew unit-test:test