Unable to install GHC 8.6.3 in Alpine 3.9

Created by: naushadh

Tried to run ghcup in an Alpine 3.9 docker container and it failed with ghc-cabal: not found

To Reproduce

Steps to reproduce the behavior:

docker run -it alpine:3.9 sh
apk add curl xz perl build-base
curl https://raw.githubusercontent.com/haskell/ghcup/master/bootstrap-haskell -sSf | sh

alpine-ghcup-8.6.3.log

System information

$ /root/.ghcup/bin/ghcup debug-info
Script version: 0.0.7

Script variables:
  GHC install location:     /root/.ghcup/ghc
  Binary install location:  /root/.ghcup/bin
  Tarball cache location:   /root/.ghcup/cache
  Downloader:               curl --fail -O <url>
  Script update url:        https://raw.githubusercontent.com/haskell/ghcup/master/ghcup
  GHC download baseurl:     https://downloads.haskell.org/~ghc
  Meta download url         https://raw.githubusercontent.com/haskell/ghcup/master/.download-urls
  Meta download format      1
  Meta version url          https://raw.githubusercontent.com/haskell/ghcup/master/.available-versions
  Meta version format       1

Detected system information:
  Architecture:   x86_64
  Distribution:   Alpine Linux
  Distro alias:   alpine
  Distro version: 3.9.2

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