CI: only generate a contrib tarball if we're on the main branch

There's no need to generate the tarball since it's not going to be used by anyone else. It's only used on master after a merge or in nightly builds.

This should save a few minutes during each contrib MR builds.

The values are

pipeline type	CI_COMMIT_BRANCH	CI_DEFAULT_BRANCH
MR pipeline	''	'master'
merged on master	'master'	'master'
nightly build	'master'	'master'

changed milestone to %4.0

added Component:: CI label

requested review from @ePirat

added MRStatus::Reviewable label

What about 3.0.x?

added MRStatus::InReview label and removed MRStatus::Reviewable label

resolved all threads

added MRStatus::Acceptable label and removed MRStatus::InReview label

In general, test vs merged runs should do the same stuff. Otherwise we may uncover failures in merge only, that then strand the whole merge process.

added MRStatus::Accepted label and removed MRStatus::Acceptable label

MR Acceptance result

This MergeRequest has been Accepted! Congratulations.

MR acceptance checks details:

• MR should be considered mergeable by Gitlab
• Last pipeline should be successful
• MergeRequest should have at least one external review and/or vote
• All threads should be resolved, and score >= 0
• MergeRequest should have no activity (threads/votes) for (24h/24h)

This message was automatically generated by homer-bot.

added 1 commit

• 5928a080 - CI: log the branch used to build in Debian job

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added 8 commits

• 5928a080...3b6a553c - 6 commits from branch videolan:master
• 70ccc951 - CI: only generate a contrib tarball if we're on the main branch
• bdf08ca5 - CI: log the branch used to build in Debian job

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For safety we should probably merge the second commit first and verify the condition works between MR and merged/nightly builds.

added MRStatus::InReview label and removed MRStatus::Accepted label

mentioned in merge request !2715 (merged)

added MRStatus::NotCompliant label and removed MRStatus::InReview label

added 15 commits

• bdf08ca5...b147b800 - 14 commits from branch videolan:master
• a54e8016 - CI: only generate a contrib tarball if we're on the main branch

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changed the description