Initialize Spring Boot docker branch with Drone pipeline

.drone.yml

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+kind: pipeline
+type: docker
+name: backend-docker
+
+trigger:
+  branch:
+    - docker
+  event:
+    - push
+
+steps:
+  - name: build-image
+    image: docker:27-cli
+    volumes:
+      - name: dockersock
+        path: /var/run/docker.sock
+    commands:
+      - docker build -t cdchen-backend:docker .
+
+  - name: deploy
+    image: docker:27-cli
+    volumes:
+      - name: dockersock
+        path: /var/run/docker.sock
+    commands:
+      - docker rm -f cdchen-backend || true
+      - docker run -d --name cdchen-backend --restart unless-stopped -p 8089:8080 cdchen-backend:docker
+
+volumes:
+  - name: dockersock
+    host:
+      path: /var/run/docker.sock

.gitignore

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+target
+.DS_Store

.mvn/wrapper/maven-wrapper.properties

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+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.8/apache-maven-3.9.8-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.3.2/maven-wrapper-3.3.2.jar

Dockerfile

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+FROM maven:3.9.8-eclipse-temurin-17 AS build
+WORKDIR /workspace
+COPY pom.xml .
+COPY src ./src
+RUN mvn -B clean package -DskipTests
+
+FROM eclipse-temurin:17-jre-alpine
+WORKDIR /app
+COPY --from=build /workspace/target/backend-0.0.1-SNAPSHOT.jar app.jar
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]

mvnw

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+#!/bin/sh
+set -e
+
+BASE_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+WRAPPER_DIR="$BASE_DIR/.mvn/wrapper"
+WRAPPER_JAR="$WRAPPER_DIR/maven-wrapper.jar"
+PROPERTIES_FILE="$WRAPPER_DIR/maven-wrapper.properties"
+
+if [ ! -f "$WRAPPER_JAR" ]; then
+  URL=$(sed -n 's/^wrapperUrl=//p' "$PROPERTIES_FILE")
+  mkdir -p "$WRAPPER_DIR"
+  curl -fsSL "$URL" -o "$WRAPPER_JAR"
+fi
+
+exec java -classpath "$WRAPPER_JAR" org.apache.maven.wrapper.MavenWrapperMain "$@"

mvnw.cmd

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+@ECHO OFF
+SETLOCAL
+set WRAPPER_JAR=%~dp0\.mvn\wrapper\maven-wrapper.jar
+if not exist "%WRAPPER_JAR%" (
+  powershell -Command "(New-Object Net.WebClient).DownloadFile('https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.3.2/maven-wrapper-3.3.2.jar','%WRAPPER_JAR%')"
+)
+java -classpath "%WRAPPER_JAR%" org.apache.maven.wrapper.MavenWrapperMain %*

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.3.1</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>cloud.cdchen</groupId>
+    <artifactId>backend</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>backend</name>
+    <description>Minimal Spring Boot service for Docker deployment</description>
+
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/cloud/cdchen/backend/BackendApplication.java

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+package cloud.cdchen.backend;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+public class BackendApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(BackendApplication.class, args);
+    }
+
+    @RestController
+    static class HealthController {
+        @GetMapping("/")
+        public String index() {
+            return "backend docker branch deployed";
+        }
+    }
+}

src/main/resources/application.yml

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+server:
+  port: 8080
+
+spring:
+  application:
+    name: backend

src/test/java/cloud/cdchen/backend/BackendApplicationTests.java

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+package cloud.cdchen.backend;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class BackendApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+}