check out Prebid and build a specific version with a list of modules

prebuild.sh

#!/usr/bin/env bash

set -euf -o pipefail

[ -d Prebid.js ] || git clone https://github.com/prebid/Prebid.js.git
cd Prebid.js

git checkout 7.36.0
npm ci
npx gulp build --modules=x,\
y,\
z

cp build/dist/prebid.js ../resources/js/prebid.js