> As another example, a more complex service may require more testing. You do the same first steps, grab commit 123, test, build, but now deploy to staging. At this point staging will be fixed to commit 123, even as development continues. A QA team can perform heavy testing, fixes are made to main and cherry picked, or the release dropped if something is very wrong. At some point the release is verified and you just promote it to production.

But how would you create that QA environment when it involves thousands of commits over a 6 month period?