Remove release:perform from maven invocation

[jrha]

The time taken to build a release has been increasing steadily and I don't expect things to get any better, currently each build takes about 1.5 hours wall time.

The most time consuming parts of the release is running the unit tests, which we should absolutely do. However, they currently they get run at least three times, once during release:prepare, again during release:perform and again when we build the metaconfig templates.

release:prepare updates the snapshot, tags the git repository, runs the tests and builds packages.
release:perform runs the tests, builds packages and uploads artifacts to the LAL Nexus.

My proposal is that we no longer run release:perform and therefore do not push artifacts to the LAL Nexus repository during releases. AFAIK we only push the pom, tar.gz and rpm to Nexus: the pom we also keep in the git repository, the rpms have the wrong names (and are unsigned) and I am unsure if anyone uses the tar.gz.

Would anything break if we stopped pushing to Nexus? I suspect not.

[stdweird]

quattor/maven-tools#55 should also help with speeding up the unittests

[jrha]

Indeed, although I still think pushing to Nexus is not very useful for the main codebase.

[jrha]

I am building 15.4 without release:perform to see what happens.

[jouvin]

I'd tend to agree with @jrha : I don't think pushing to Nexus is really useful for anything not used by Maven as a plugin... and for these components, it must be pushed to Maven central, not LAL nexus... If we can shutdown the LAL Nexus server at some point, I would be happy!

[loomis]

If the central repository for artifacts isn't useful, then you can just use the "install" target rather than the "deploy" target when running the release goals. There are release parameters that allow you to set what goals are used as the various stages of the release process. You can also selectively turn off the testing by setting the "-DskipTests" flag for either the "release:prepare" or "release:perform" stages.

[stdweird]

@jrha did you actually make 15.4 without this? shall i merge it for 15.8?

[jrha]

I did make 15.4 without it!