RFR: 6925: Cache the local maven repo between runs

[Marcus Hirt]

On Fri, 9 Oct 2020 05:40:03 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.

Hi Gunnar! The issue is JMC-6925.

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