support conddb for patch releases in read-only mode

[mmusich]

resolves #42292

PR description:

Title says it all.

PR validation:

private tests

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

TBD

[cmsbuild]

@mmusich, CMSSW_13_3_X branch is closed for direct updates. cms-bot is going to move this PR to master branch.
In future, please use cmssw master branch to submit your changes.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-42324/36351

• This PR adds an extra 12KB to repository

[cmsbuild]

A new Pull Request was created by @mmusich (Marco Musich) for master.

It involves the following packages:

• CondCore/Utilities (db)

@perrotta, @consuegs, @cmsbuild, @saumyaphor4252, @francescobrivio, @tvami can you please review it and eventually sign? Thanks.
@mmusich this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[tvami]

@cmsbuild , please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-bd5a7f/33811/summary.html
COMMIT: 15767a2
CMSSW: CMSSW_13_3_X_2023-07-20-1100/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/42324/33811/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 13 lines from the logs
• Reco comparison results: 14 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3197149
• DQMHistoTests: Total failures: 10
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3197117
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 207 log files, 159 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[francescobrivio]

+db

• let's have this merged now and later I'll add a few comments to clarify the code and open the backports

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[francescobrivio]

@rappoccio @perrotta if you could merge this by tonight's 2300 IB, I'll pick it up tomorrow to make new PRs and backports! Thanks!

[perrotta]

+1