You could create that test environment image beforehand, mirror it and use it for the job that needs it. No need for adding another container within a container.
But even if I run in a container e.g. a Github actions runner I can use buildah to build my image right? So no need for another container. Why is there another layer needed?
Why do we even need banks? If they make money by lending money that mostly belong the people (state/feds) anyways, I guess we all would be better if banking was just a state monopol.
I guess I'm just missing some points here so maybe someone can help and explain me why this is a bad idea?!
You don't know what it does as its a closed system. But even heavier for me counts the fact that you can't replace its hdd which will fail after years of usage no matter what. Also you will not receive any security updated after seven years.
Don't give up your freedom just because of laziness!
Err why should I want my UI eat up my RAM - it's a resource. I also don't buy this argument that its OK for modern OSes to eat up 3-4GB of RAM and that it doesn't matter and that it frees it if you need it...
In my experience over time dev teams stop looking at that metrics on a board and all we really need are proper monitors/alarms that cover all relevant cases of our domain and writes a slack message or sends an email... KISS!