Add Docker best practices system prompt for Java 25 #728

Job	Run time
Generate Cursor Rules	24s
Validate Markdown Files	18s
Build Examples (Spring Boot, examples/spring-boot-demo/implementation, verify -Pjacoco)	22s
Build Examples (Maven, examples/maven-demo, verify)	23s
Build Examples (Quarkus, examples/quarkus-demo, package)	32s
Build Examples (AWS Lambda, examples/aws-lambda-hello-world, package)	19s
Build Examples (Spring Boot Memory Leak, examples/spring-boot-memory-leak-demo, package)	25s
Build Examples (Azure Function, examples/azure-function-hello-world, package)	18s
Build Examples (Spring Boot Performance Bottleneck, examples/spring-boot-performance-bottleneck-d...	25s
Build Examples (Spring Boot JMeter, examples/spring-boot-jmeter-demo, package)	25s
	3m 51s

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