feat(pkg) add 'mirrorbrain' user back under puppet management

[dduportal]

Related to jenkins-infra/helpdesk#3414 (comment)

This PR fixes #3351 by putting back the mirrorbrain user under puppet management and also manages the .azure-storage-env with the current values from resources managed in https://github.com/jenkins-infra/azure/blob/main/get.jenkins.io.tf.

Added resources comes from #2185.

Tested locally with vagrant but of course there could be a configuration shift with production: before merging, the puppet agent on pkg VM must be disabled and stopped. Once merged, a puppet noop command is needed to compare the expected changes (and avoid breaking the current setup which is manually managed).

Note that a manual cleanup is required after this PR is applied. The following files will have to be removed:

• /srv/releases/.ssh/gruenehoelle_mirror* (ref. Mirror-decommission: mirror.gruenehoelle.nl helpdesk#3281)
• /srv/releases/.ssh/mirrorbits-staging* (not used anywhere)

[dduportal]

Puppet agent disabled on the pkg VM. But please don't merge if approved.

[lemeurherve]

🎉

[dduportal]

Deployment result:

• ✅ Puppet agent execution reported:

Mar 29 06:39:00 ip-172-31-33-96 puppet-agent[13349]: (/Stage[main]/Profile::Pkgrepo/File[/var/www/pkg.jenkins.io/redhat-stable/jenkins.io.key]/content) content changed <redacted> (corrective)
Mar 29 06:39:01 ip-172-31-33-96 puppet-agent[13349]: (/Stage[main]/Profile::Pkgrepo/File[/srv/releases/.ssh/archives]/content) content changed <redacted>
Mar 29 06:39:01 ip-172-31-33-96 puppet-agent[13349]: (/Stage[main]/Profile::Pkgrepo/File[/srv/releases/.ssh/config]/content) content changed <redacted>
Mar 29 06:39:01 ip-172-31-33-96 puppet-agent[13349]: (/Stage[main]/Profile::Pkgrepo/File[/srv/releases/.azure-storage-env]/group) group changed 'root' to 'mirrorbrain'
Mar 29 06:39:01 ip-172-31-33-96 puppet-agent[13349]: (/Stage[main]/Profile::Pkgrepo/File[/srv/releases/.azure-storage-env]/mode) mode changed '0644' to '0600'

• ✅ Tried changing the mirrorbrain crontab: the 2nd puppet agent execution removed my change (as expected)

• ✅ sync.sh manual execution:

+ echo '>> Script sync.sh finished'
+ exit 0

real    1m38.052s
user    1m44.130s
sys     0m19.152s

• ✅ Update center ran without any issues