fix(yarn): sub package use root npmrc

lib/manager/npm/extract/__snapshots__/monorepo.spec.ts.snap

@@ -168,6 +168,8 @@ Array [
 exports[`manager/npm/extract/monorepo .extractPackageFile() uses yarn workspaces package settings without lerna 1`] = `
 Array [
   Object {
+    "npmrc": "@org:registry=//registry.some.org
+",
     "packageFile": "package.json",
     "yarnWorkspacesPackages": "packages/*",
   },
@@ -178,6 +180,8 @@ Array [
       "lernaJsonFile": undefined,
     },
     "npmLock": undefined,
+    "npmrc": "@org:registry=//registry.some.org
+",
     "packageFile": "packages/a/package.json",
     "packageJsonName": "@org/a",
     "yarnLock": "yarn.lock",

lib/manager/npm/extract/monorepo.spec.ts

@@ -139,6 +139,7 @@ describe(getName(), () => {
       const packageFiles = [
         {
           packageFile: 'package.json',
+          npmrc: '@org:registry=//registry.some.org\n',
           yarnWorkspacesPackages: 'packages/*',
         },
         {

lib/manager/npm/extract/monorepo.ts

@@ -17,6 +17,7 @@ export async function detectMonorepos(
       packageFile,
       npmLock,
       yarnLock,
+      npmrc,
       managerData = {},
       lernaClient,
       lernaPackages,
@@ -52,6 +53,7 @@ export async function detectMonorepos(
         subPackage.npmLock = subPackage.npmLock || npmLock;
         if (subPackage.yarnLock) {
           subPackage.hasYarnWorkspaces = !!yarnWorkspacesPackages;
+          subPackage.npmrc = subPackage.npmrc || npmrc;
         }
         if (!updateInternalDeps) {
           subPackage.deps?.forEach((dep) => {