Have cooldown weeks or days for breaking changes in CI

[gustavovalverde]

Sometimes making a bunch of changes to CI might have a great impact on development if something fails. We might want to reduce this changes in specific dates.

[dconnolly]

Proposal: for our two-week sprints, the second week/week leading up to a release/tag, we pause merging changes to CI until the tag is done. Fixes to CI would still be allowed to merge

[oxarbitrage]

Proposal: freeze the CI changes in the second way of the sprint and create the release in that week.

[teor2345]

Extra Proposal: When the PR backlog is large or urgent, we pause breaking CI changes until those PRs merge.

Here are some rough guidelines for "large or urgent":

• more than 20 PRs
• any critical PRs
• more than one high-priority PR

[mpguerra]

I feel like we already do this now