Let renovate find maintained LTS node.js versions automatically

[NotMyFault]

Closes #8380 by automating this.

[dduportal]

I am late to the party, but could we use the version provided by the agents in ci.jenkins.io? We keep it up to date and it would avoid downloading too much on each build

[NotMyFault]

I am late to the party, but could we use the version provided by the agents in ci.jenkins.io? We keep it up to date and it would avoid downloading too much on each build

Surely, which version is currently installed?

[dduportal]

I am late to the party, but could we use the version provided by the agents in ci.jenkins.io? We keep it up to date and it would avoid downloading too much on each build

Surely, which version is currently installed?

Currently it's 22.18.0: https://github.com/jenkins-infra/packer-images/blob/2.60.0/provisioning/tools-versions.yml#L32

• The version of the "agent template" deployed in production is found in https://github.com/jenkins-infra/jenkins-infra/blob/production/hieradata/common.yaml#L240. It's 2.60.0 right now.
• The permalink above (https://github.com/jenkins-infra/packer-images/blob/2.60.0/provisioning/tools-versions.yml#L32) contains the 2.60.0 tag and points to a YAML file (which may be parsed).

You have a working example of automation (but using updatecli) which retrieves the Maven version of the currently deployed agents: https://github.com/jenkins-infra/jenkins-infra/blob/1d51037e666d47cddc0bf0da3b6fa35592d0a741/updatecli/updatecli.d/jenkinscontroller-tools-maven.yaml#L16-L32.

Note: It's important to note that the main branch of https://github.com/jenkins-infra/packer-images must NOT be used because it is not released (not tag yet) / deployed (waiting for the tag) 95% of the time. We usually deploy it once a week (average on a whole year).
For instance, it currently shows version 2.19.0 (merged earlier today) but not released yet: https://github.com/jenkins-infra/packer-images/blob/main/provisioning/tools-versions.yml#L32

[dduportal]

Looks like this PR is superseded by #8522

Can you confirm @NotMyFault?