`script/setup` fails with `./script/bootstrap: line 45: yarn: command not found` even if `yarn` is installed

[hamirmahal]

script/setup fails with ./script/bootstrap: line 45: yarn: command not found even if yarn is installed.

[hamirmahal]

main ~/os-webview 0 $   script/setup 
==> Setting correct node version (see ./.nvmrc) ... OK
==> Installing JavaScript Packages ... 
./script/bootstrap: line 45: yarn: command not found
script/setup: ERROR: could not run [yarn --prefer-offline]

main ~/os-webview 112 $  yarn -v
1.22.22

main ~/os-webview 0 $   node -v
v20.9.0

main ~/os-webview 0 $  cat ./.nvmrc 
v18.19.0

main ~/os-webview 0 $  nvm use v18
Now using node v18.20.3 (npm v10.7.0)

main ~/os-webview 0 $  yarn -v
1.22.22

main ~/os-webview 0 $  node -v
v18.20.3

main ~/os-webview 0 $  script/setup 
==> Setting correct node version (see ./.nvmrc) ... OK
==> Installing JavaScript Packages ... 
./script/bootstrap: line 45: yarn: command not found
script/setup: ERROR: could not run [yarn --prefer-offline]

[hamirmahal]

main ~/os-webview 0 $  ls
Brewfile         package.json  src                  test               yarn.lock
CONTRIBUTING.md  README.md     stats.json           tsconfig.json
__mocks__        script        stylelint.config.js  webpack.config.js

main ~/os-webview 0 $  command -v yarn
/home/hamir/.nvm/versions/node/v18.20.3/bin/yarn