CI enforce code format

[6543]

• enforce CI to only allow formatted code
• add make target to check code format
• format code

[6543]

@buro9 now only add one task more finishing in in 4s so it should not be a big deal for CI to add but a nice improvement for added code ;)

[6543]

@buro9 ci failed unrelated can you restart it?

[buro9]

@buro9 ci failed unrelated can you restart it?

Done 👍

[6543]

@buro9 I think it is ready :)