ci: minimal CI workflows (#11)

- Introduce GitHub Actions workflows to automate builds, tests, and test report summarization.
- Add branch-specific triggers for `push` and `pull_request` events, and skip runs for draft pull requests.

Author: eazyhozy

.github/workflows/continuous-integration.yml

@@ -0,0 +1,50 @@
+name: 'Continuous Integration'
+
+on:
+  push:
+    branches: [ main ]
+
+  pull_request:
+    branches: [ main ]
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - ready_for_review
+
+jobs:
+  build:
+    if: >
+      github.event_name == 'push' ||
+      (github.event_name == 'pull_request' && github.event.pull_request.draft == false)
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v5
+        with:
+          cache-read-only: false
+
+      - name: Build (Check, Compile, Test)
+        id: build
+        continue-on-error: true
+        run: ./gradlew build
+
+      - name: Summarize Test Report
+        uses: dorny/test-reporter@v2
+        if: ${{ !cancelled() }}
+        with:
+          name: Test Report
+          path: '**/build/test-results/test/TEST-*.xml'
+          reporter: java-junit
+
+      - name: Fail job if build failed
+        if: ${{ steps.build.outcome == 'failure' }}
+        run: exit 1

gradle.properties

@@ -1,2 +1,4 @@
 group=com.kakao.actionbase
 version=0.0.1-SNAPSHOT
+
+org.gradle.caching=true