Add sbom module: Spring Boot 4.2.0-RC1 tools jar-mode sbom command, CycloneDX in the jar, Actuator endpoint, licence check and OSV scan

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cfo2K4u4rF18QsPXPFnytf

README.md

@@ -9,6 +9,7 @@ files.
 
 | Directory | Article | What it demonstrates |
 |---|---|---|
+| [`sbom/`](sbom) | [Spring Boot SBOM in Practice: the tools jar-mode sbom Command, CycloneDX and Dependency Scanning](https://ankurm.com/spring-boot-sbom-tools-jarmode-cyclonedx-dependency-scanning/) | the 4.2.0-RC1 `java -Djarmode=tools -jar app.jar sbom` command (absent in 4.1.2), the CycloneDX document the build puts in the jar, `/actuator/sbom`, an SBOM that lists 8 starters not in the jar and misses the jar mode's own library, a licence rule that wrongly flags dual-licensed logback, and an OSV scan that finds Log4Shell in a deliberately old build |
 | [`hexagonal/`](hexagonal) | [Hexagonal Architecture (Ports and Adapters) in Spring Boot 4](https://ankurm.com/hexagonal-architecture-ports-and-adapters-spring-boot-4/) | a 4-module Maven reactor that makes "the core has no Spring dependency" something `mvn dependency:tree` proves rather than a naming convention, testing the core with zero Spring context, and a Spring Boot 4 test-slice-artifact split (`@DataJpaTest`, `@WebMvcTest`, `TestRestTemplate`) hit and fixed along the way |
 | [`actuator-in-production/`](actuator-in-production) | [Spring Boot Actuator in Production](https://ankurm.com/spring-boot-actuator-production-endpoints-security-health-indicators/) | endpoint exposure defaults, securing Actuator, custom health indicators and how they hang |
 | [`spring-boot-startup-time/`](spring-boot-startup-time) | [Why Your Spring Boot App Takes 8 Seconds to Start](spring-boot-startup-time/post/post.md) | `BufferingApplicationStartup`, JFR startup events, self time vs total time, the classpath-scan tax, the JDK 25 AOT cache |