feat: complete todo backend with monitoring

- Spring Boot REST API with CRUD operations
- PostgreSQL with HikariCP connection pool
- Multi-stage Docker build (Gradle 8.14 + JRE Alpine)
- Docker Compose orchestration
- Prometheus metrics collection
- Grafana dashboards (app & database)
- Clean layered architecture (Entity/Repository/Service/Controller/DTO)
- Global exception handling
- Actuator health checks

.gitignore

@@ -1,4 +1,3 @@
-HELP.md
 .gradle
 build/
 !gradle/wrapper/gradle-wrapper.jar
@@ -35,3 +34,6 @@ out/
 
 ### VS Code ###
 .vscode/
+
+### Docker ###
+*.jar

Dockerfile

@@ -1,8 +1,18 @@
+FROM gradle:8.14-jdk21 AS build
+
+WORKDIR /app
+
+COPY build.gradle settings.gradle ./
+COPY gradle ./gradle
+COPY src ./src
+
+RUN gradle clean build -x test --no-daemon
+
 FROM eclipse-temurin:21-jre-alpine
 
 WORKDIR /app
 
-COPY build/libs/*.jar app.jar
+COPY --from=build /app/build/libs/*.jar app.jar
 
 EXPOSE 8080
 

HELP.md

@@ -0,0 +1,24 @@
+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Gradle documentation](https://docs.gradle.org)
+* [Spring Boot Gradle Plugin Reference Guide](https://docs.spring.io/spring-boot/4.1.1/gradle-plugin)
+* [Create an OCI image](https://docs.spring.io/spring-boot/4.1.1/gradle-plugin/packaging-oci-image.html)
+* [Spring Web](https://docs.spring.io/spring-boot/4.1.1/reference/web/servlet.html)
+* [Validation](https://docs.spring.io/spring-boot/4.1.1/reference/io/validation.html)
+
+### Guides
+The following guides illustrate how to use some features concretely:
+
+* [Building a RESTful Web Service](https://spring.io/guides/gs/rest-service/)
+* [Serving Web Content with Spring MVC](https://spring.io/guides/gs/serving-web-content/)
+* [Building REST services with Spring](https://spring.io/guides/tutorials/rest/)
+* [Validation](https://spring.io/guides/gs/validating-form-input/)
+
+### Additional Links
+These additional references should also help you:
+
+* [Gradle Build Scans – insights for your project's build](https://scans.gradle.com#gradle)
+