Make sure we can do safe rollbacks and reverts

[ljodal]

We need a good way to disable automatic deploys, for example in this case:

1. I commit x, it fails in prod
2. Someone commits y
3. I commit a revert of x, z

We don't want to even try to deploy y. Ideally the first thing we do here is to deploy x - 1, halt deploys, and then manually trigger a deploy for z once that's ready.

[ljodal]

One way of solving this is to disable the workflow in GitHub, let's check if there's an API endpoint for doing this.

[thor]

⚠️ This issue needs additional triaging or it will be closed within the next few weeks. ⚠️

In particular, this issue needs issue type labels.

The issue should be labeled with either

• for additional features or use-cases,
• for smaller user-visible improvements,
• for issues relating to technical debt or refactoring, and
• for errors in behaviour as experienced by us or users.

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For more information please see https://github.com/kolonialno/cloud-platform-tasks/issues/401.