Fix Jenkins war download URLs

[alextu]

Looks like download URLs are broken, switched to working ones in this PR.

Testing done

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[dduportal]

Hi @alextu , it looks like you've faced a downtime during our operation: jenkins-infra/helpdesk#3828 (comment) (or with status.jenkins.io where we publish usually downtime etc. - see https://status.jenkins.io/issues/2024-01-08-get-jenkins-io-maintenance/)

The URL using get.jenkins.io must be preferred (in any cases, `updates.jenkins.io will trigger a series of HTTP redirect ending on get.jenkins.io which is the download entrypoint). See the URL in https://www.jenkins.io/download/ for instance.

Sorry for the inconvenience we caused with this downtime.

(btw thanks @lemeurherve for pointing this PR)

[alextu]

ah thanks for notifying, although I still get 404 for https://get.jenkins.io/war/latest/jenkins.war and https://get.jenkins.io/war-stable/latest/jenkins.war. What are the correct "https://get.jenkins.io URLs" to get the latest and latest lts without having to know the exact version upfront ?

[lemeurherve]

Hello @alextu, that's the correct way, just it's not working at the moment. see @dduportal comment below.

See this help desk issue to follow its resolution: jenkins-infra/helpdesk#3894 (comment)

[dduportal]

ah thanks for notifying, although I still get 404 for https://get.jenkins.io/war/latest/jenkins.war and https://get.jenkins.io/war-stable/latest/jenkins.war. What are the correct "https://get.jenkins.io URLs" to get the latest and latest lts without having to know the exact version upfront ?

The URL is good: it is an ongoing issue we are currently facing (ref. jenkins-infra/helpdesk#3894 (comment)).

However I realize the servuce updates.jenkins.io provides the resolution of the "latest" version in a different way than the get.jenkins.io with its latest (first one uses custom Apache logic generated by the update center while the second relies on symlinks in the storage).
The latter one is subject to numerous issues (the one I linked earlier but other) so I believe this PR should be merge for you to unblock you.

I'll notice the whole infra team about the /current/latest feature for update center for future operations.

Sorry for the noise.

[alextu]

Thanks for the explanation and good luck with the ongoing issue!

[lemeurherve]

BTW, @alextu next time you see this kind of issue don't hesitate to open a help desk ticket at https://github.com/jenkins-infra/helpdesk/issues/new/choose, that helps us a lot!

[dduportal]

Notes:

• The URL https://get.jenkins.io/war/latest/jenkins.war is now properly redirected to https://archives.jenkins.io/war/latest/jenkins.war since mirrors.jenkins.io redirect incorrect for 2.440 Debian installer jenkins-infra/helpdesk#3894 (comment)
• As per Symbolic link for "latest" for windows-stable in get.jenkins.io points to older release jenkins-infra/helpdesk#3860, there might be other issues with the latest representation within get.jenkins.io, which further justifies the PR here.