ci: skip test when cache is enabled

[kenhys]

It omits redundant tests.

• Usually source code was changed, and always ci tests them. It might be redundant when it will be tested with subsequent commits during development.
• When they were cached, ci skip tests. It assumes that CI pass test case in the previous commit
  • If you want to ensure CI results in that commit again, invoke workflow dispatch.

[Watson1978]

👍🏻

[daipom]

I understand that we want to skip the build if possible, since it takes a lot of time.
However, I think it’s fine to run the tests every time, even if it feels redundant.

[kenhys]

It might be good for the development phase, but not for production, so I'll close it.