ci: add continuous integration workflow

Introduce a CI pipeline using GitHub Actions to automate
builds, tests, and test report summarization.

Author: eazyhozy

.github/workflows/continuous-integration.yml

@@ -0,0 +1,37 @@
+name: 'Continuous Integration'
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    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
+
+      - name: Build (Check, Compile, Test)
+        id: build
+        continue-on-error: true
+        run: ./gradlew build
+
+      - name: Summarize OSS 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 tests failed
+        if: ${{ steps.build.outcome == 'failure' }}
+        run: exit 1