align project name with the tutorial (https://spring.io/guides/gs/messaging-rabbitmq/)

[naXa777]

goal: the following commands given in the tutorial should work "as is"

• java -jar build/libs/gs-messaging-rabbitmq-0.1.0.jar
• java -jar target/gs-messaging-rabbitmq-0.1.0.jar

without this change the above commands generate an error like:

Error: Unable to access jarfile build/libs/gs-messaging-rabbitmq-0.1.0.jar

[naXa777]

@artembilan @dsyer please review

[artembilan]

This one requires a team discussion since all of the guides suffer same problem.
Those tutorials are based on this template: https://raw.githubusercontent.com/spring-guides/getting-started-macros/main/build_an_executable_jar_with_both.adoc.

Therefore the name for the artifact is really not what is chosen in the build config, but just top project id, like this one is gs-messaging-rabbitmq.

[naXa777]

@artembilan @dsyer did you have a chance to discuss the problem?

[robertmcnees]

Hi @naXa777. The underlying issue for this PR should be fixed with a recent PR #43. Specifically, this PR adds an additional variable so that the project_id and build_name can be different.

The build section now uses a different common file for instructions. If you get around to it, give the guide a try with the updated instructions.