same here!
tried both
.yarnrc
"@scope:registry" "https://gitlab.com/api/v4/packages/npm/"
"//gitlab.com/api/v4/packages/npm/:_authToken" "${NPM_TOKEN}"
and .yarnrc.yml
npmScopes:
scope:
npmRegistryServer: 'https://gitlab.com/api/v4/packages/npm/'
npmRegistries:
//gitlab.com/api/v4/packages/npm/:
npmAlwaysAuth: true
npmAuthToken: ${NPM_TOKEN}
yet npm works with .npmrc with same values