ci: easy repo switching #192
   Merged  
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PR Checklist
Please check if your PR fulfills the following requirements:
PR Type
What kind of change does this PR introduce?
What is the current behavior?
Currently, it's really difficult to switch between MageOS mirror and Magento when validating things around release days of MageOS/Magento. This addresses that.
Fixes: N/A
What is the new behavior?
A simple way to switch to the other repo.
Does this PR introduce a breaking change?
Other information