add max workers

projects/nshmp-apps/jest.config.ts

@@ -5,6 +5,7 @@ const config: Config.InitialOptions = {
   coverageDirectory: '<rootDir>/../../coverage/nshmp-apps',
   coverageReporters: ['text-summary', 'html'],
   globalSetup: 'jest-preset-angular/global-setup',
+  maxWorkers: '80%',
   moduleNameMapper: pathsToModuleNameMapper(
     {'projects/*': ['*']},
     {prefix: '<rootDir>/..'}