Haskell feature won't install behind proxy needing explicit configuration via HTTP(S)_PROXY environment variables.

[alaendle]

features/src/haskell/install.sh

Line 42 in a0ff75b

sudo -iu "$_REMOTE_USER" <<EOF

is dropping all environment variables from the current shell. So we won't have http proxy settings available when calling curl

features/src/haskell/install.sh

Line 64 in a0ff75b

curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh

leading to

 => => # curl: (6) Could not resolve host: get-ghcup.haskell.org

So so this basically a feature request to support using this feature behind a proxy that requires external configuration via HTTP_PROXY, HTTPS_PROXY environment variables.