AWS Amplify - Lerna Monorepo - Can't install private github package - aws-amplify

Question

I am having trouble installing a private github package with my lerna monorepo using AWS Amplify hosting.
I have updated the build settings to create a .npmrc file at the time of build and install the package in the preBuild stage, however when it begins the build stage it cannot find the module.
Reproduction steps
Set up amplify hosting for react app as monorepo (Lerna)
Update build settings to create .npmrc and install package
Run build
Build settings
version: 1
applications:
- backend:
phases:
build:
commands:
- '# Execute Amplify CLI with the helper script'
- amplifyPush --simple
frontend:
phases:
preBuild:
commands:
- yarn install --frozen-lockfile
- echo -e "always-auth=true\n#apptractive:registry=https://npm.pkg.github.com/\n//npm.pkg.github.com/:_authToken=$NPM_AUTH_TOKEN" > .npmrc
- yarn add #apptractive/shared
- yarn add #apptractive/design-system-web
build:
commands:
- yarn run build
artifacts:
baseDirectory: build
files:
- '**/*'
cache:
paths:
- node_modules/**/*
appRoot: packages/backoffice-app
Error that shows

Answer 1

Okay I found that I needed to build the packages within the build script as they were being imported from the monorepo itself and not github packages.
Probably can be done with a better approach, but this got me over the line for now
version: 1
applications:
- backend:
phases:
build:
commands:
- '# Execute Amplify CLI with the helper script'
- amplifyPush --simple
frontend:
phases:
preBuild:
commands:
- yarn global add lerna
- npm config set registry https://npm.pkg.github.com
- npm config set always-auth true
- npm config set //https://npm.pkg.github.com/:_authToken=${NPM_AUTH_TOKEN}
- lerna bootstrap --include-dependencies
- cd ../shared && yarn build
- cd ../design-web && yarn build
build:
commands:
- yarn run build
artifacts:
baseDirectory: build
files:
- '**/*'
cache:
paths:
- node_modules/**/*
appRoot: packages/backoffice-app