Merge branch 'sachinjoseph/support-custom-environment-variables-for-install-manager' of https://github.com/microsoft/web-build-tools into sachinjoseph/support-custom-environment-variables-for-install-manager

Author: sachinjoseph

apps/rush-lib/src/cli/actions/BaseInstallAction.ts

@@ -107,7 +107,7 @@ export abstract class BaseInstallAction extends BaseRushAction {
     // Because the 'defautltValue' option on the _maxInstallAttempts parameter is set,
     // it is safe to assume that the value is not null
     if (this._maxInstallAttempts.value! < 1) {
-      throw new Error(`The value of "${this._maxInstallAttempts.longName}" must be positive.`);
+      throw new Error(`The value of "${this._maxInstallAttempts.longName}" must be positive and nonzero.`);
     }
 
     const installManagerOptions: IInstallManagerOptions = this.buildInstallOptions();