Add a `--force` option to `ghcup install <tool> --isolate`

1. Change current behavior of cabal/stack/hls to non-overwriting
2. Add --force option that omits overwriting check for both cabal/stack/hls and GHC

added typeimprovement label

@arjun

yea, this looks like a good idea.

do we want this to work for just for isolates or any install command?

for eg:- can i --force without isolate, where it will overwrite a normal install as well ?

do we want this to work for just for isolates or any install command?

We could implement that for regular install as well, which would then have to invoke the tool removal beforehand. We do that already with ghcup compile ghc -b 8.10.5 -v 8.10.5 when 8.10.5 is already installed: https://gitlab.haskell.org/haskell/ghcup-hs/-/blob/608ee07940926cdb2a9cb12127c0ae9ef9c26748/lib/GHCup.hs#L1903

changed milestone to %0.1.16.3

I think this is better done in two parts:-

1. Makes the default isolate behavior non-overwriting first. (addressed with !149 (merged) )

2. Adds the --force option for both normal and isolated installs (addressed with !156 (merged) )

closed

This is all done right?

yes