Shortcircuit or logical OR of jobs
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### Problem to solve
Customers need continuous delivery pipelines such that only one of two actions is needed before a pipeline proceeds to subsequent stages. e.g. deploy to a canary and then wait for either a manual action OR a 30-minute delay before deploying to production.
### Further details
Example shown on https://cloud.google.com/solutions/continuous-delivery/:

Currently, we can't support this as both the manual approval AND the delayed job would be required to succeed before the production deploy would happen.
### Proposal
Maybe a simple way to support this is to be able to declare a stage as a logical OR instead of logical AND of job statuses.
### What does success look like, and how can we measure that?
Users are able to model their preferred deployment flow in `.gitlab-ci.yml`.
<!-- If no way to measure success, link to an issue that will implement a way to measure this -->
### Links / references
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