[install] add bun install and fix-bun to install script

3 jobs for dev-spago-next in 6 minutes and 13 seconds (queued for 3 minutes and 2 seconds)
Status Job ID Name Coverage
  Deps
passed #12807
deps

00:03:59

 
  Compile
failed #12808
compile

00:02:13

 
  Test
skipped #12809
test
 
Name Stage Failure
failed
compile Compile
 Saved lockfile

1 package installed [2.70s]
Compiling
$ spago build
/nix/store/gabs49v4yacq6hdd1s5bnjyfrx1yaan3-bash-interactive-5.2-p15/bin/bash: line 1: spago: command not found
error: script "build" exited with code 127
Cleaning up file based variables
ERROR: Job failed: exit code 1