RFR: 1234: Caching Maven repo

[Gunnar Morling]

On Thu, 8 Oct 2020 20:45:00 GMT, Gunnar Morling <github.com+28612+gunnarmorling at openjdk.org> wrote:

> So this adds the caching of Maven dependencies we discussed in the other PR. While testing this in my fork, it reduced
> the build time from ~30 min to ~23 min. I'll reword the commit message if there's agreement on this and a Jira issue
> exists. Thanks!

Note I haven't really groked the build yet, I suppose there are specific steps in place for downloading the Eclipse
target platform and such. Not sure whether all that is done via Maven's resolver and thus will benefit from this
caching?

Btw. I noticed quite a few downloads via http (instead of https) in what I suppose is the target platform provisioning;
would be great if we could ban any non-https sources.

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PR: https://git.openjdk.java.net/jmc/pull/124