Add support for maven snapshot version updates

[rona-tombo]

What would you like Renovate to be able to do?

I am currently implementing a project called MockPaper.
This project's dependency paper-api (familiar from Minecraft) uses the SNAPSHOT release.
If you specify a dependency using the -SNAPSHOT suffix (e.x. 1.18.1-R0.1-SNAPSHOT), depending on when you build, the build may failed due to changes in method signatures, etc.
Therefore, we are using a notation that points to a specific snapshot version (e.x. 1.18.1-R0.1-20220104.205543-66), and we would like to update this specific snapshot version using renovate.

If you have any ideas on how this should be implemented, please tell us here.

It appears that many Maven projects using SNAPSHOT releases are deployed using Nexus.

The tag structure for the SNAPSHOT version in Nexus is
{baseVersion}-{deployDate}-{random}-{rivision}
It seems to be like this.

All snapshots are searched from under baseVersion, and rivision is the most.

Is this a feature you are interested in implementing yourself?

No

[HonkingGoose]

I found this issue, which looks related:

• Support pinned snapshot versions in maven datasource #14300

[rarkins]

#14300 includes essentially two feature requests, so let's keep this one for the "update snapshot versions" request and #14300 for "pin snapshot versions" (which should come second).

For this one, we need a reproduction where there's a public package with these same characteristics.

[github-actions[bot]]

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