validate_url and download_extension request every URL twice, and don't re-use connections, making builds really slow about docker-geoserver HOT 3 CLOSED

@miceg thanks for the fixes, I merged your PR's earlier today. Should be fine for you to do a PR

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I've implemented this in a private repo, I added a separate layer which generates a curl configuration file to download everything, and runs that. It runs in parallel with the rest of the geoserver-prod image, so there's a small speed-up there too.

With my changes, clean build times went from 8min 19sec to 4min 18sec. Rebuilds with no plugin changes are even faster: around 2 minutes!

Docker cache mounts would make changing the plugin set faster again, but would require more architectural changes.

It would be even faster, but the "required" and "stable" GeoServer plugin downloads are on SourceForge, which takes about 1.5 - 3.0 sec per URL to bounce through their terrible redirect chain, which is across three different hostnames... and even though they use a CDN. 🙃

Upstreaming this change is currently blocked on #651, because that PR changes the set of required plugins, and my implementation also incorporates this change.

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This has been merged

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