chore: build CI

.github/workflows/main.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  project-build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v4
+
+    - name: Setup Java
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: 21
+
+    - name: Build with Gradle
+      run: ./gradlew build
+
+    - name: Build Docker image
+      run: docker build --build-arg JAR_FILE=build/libs/\*.jar -t springio/gs-spring-boot-docker .

.github/workflows/pull-request.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  project-build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v4
+
+    - name: Setup Java
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: 21
+
+    - name: Build with Gradle
+      run: ./gradlew build
+
+    - name: Build Docker image
+      run: docker build --build-arg JAR_FILE=build/libs/\*.jar -t springio/gs-spring-boot-docker .

Dockerfile

@@ -0,0 +1,4 @@
+FROM openjdk:21
+ARG JAR_FILE=build/libs/*.jar
+COPY ${JAR_FILE} app.jar
+ENTRYPOINT ["java","-jar","/app.jar"]

src/main/java/tw/commonground/backend/BackendApplication.java

@@ -2,12 +2,20 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
 
 @SpringBootApplication
+@RestController
 public class BackendApplication {
 
-	public static void main(String[] args) {
-		SpringApplication.run(BackendApplication.class, args);
-	}
+  @RequestMapping("/")
+  public String home() {
+    return "Hello Docker World";
+  }
 
-}
+  public static void main(String[] args) {
+    SpringApplication.run(BackendApplication.class, args);
+  }
+
+}