File README.yarn of Package portainer

update .yarnrc:

yarn config set yarn-offline-mirror ./npm-packages-offline-cache
yarn config set yarn-offline-mirror-pruning true

# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
# yarn lockfile v1


yarn-offline-mirror "/home/abuild/npm-packages-offline-cache"
yarn-offline-mirror-pruning true

Im Git checkout:
patch package.json
tar xf ../npm-packages-offline-cache.tar.gz .yarnrc

create packages:
yarn cache clean
yarn install --force
tar czf ../npm-packages-offline-cache.tar.gz npm-packages-offline-cache yarn.lock .yarnrc
inside buildenv:
cd
tar xf rpmbuild/SOURCES/npm-packages-offline-cache.tar.gz
cp rpmbuild/SOURCES/yarn.lock .

yarn install --offline --verbose --force