[SE-3340] Introduce separate stage and prod deploys
This PR changes the CI/CD logic to be able to deploy to stage and production environments separately in addition that the production deploys will require manual approval as well.
Dependencies:
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Create stage branch called stage
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Create production branch called production
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After approval but before merge, notice everyone about the upcoming change
Merge deadline: None
Testing instructions:
N/A
Author notes and concerns:
- Production branch must have the same branch protection settings that master has
- I have no idea how to test this change before merging it, but if you have one, please let me know and I'll adjust the Testing section.
- I have no rights yet to create the branches mentioned above, so I'll need a core member for that