Maybe ruby is already installed

- remove apt install ruby
1 job for 4-bootstrap4-sass-only in 21 seconds
Name Stage Failure
failed
build_css Test There is an unknown failure, please try again
  +-- grunt-known-options@1.1.0 
+-- nopt@3.0.6
| `-- abbrev@1.1.0
`-- resolve@1.1.7

npm info ok
$ gem install sass
/bin/bash: line 48: gem: command not found
ERROR: Build failed: exit code 1