message: jest: specify cache key method
  so that if the runtime location is changed locally, the module will be re-created.
  fixes
diff: @@ -2,6 +2,8 @@ import { StylableConfig } from '@stylable/core';
  import { Options, stylableModuleFactory } from '@stylable/module-utils';
  import fs from 'fs';
  +const stylableRuntimePath = require.resolve('@stylable/runtime');
  +
  export function processFactory(
  stylableConfig?: Partial<StylableConfig>,
  factoryOptions?: Partial<Options>
  @@ -15,8 +17,19 @@ export function processFactory(
  },
  // ensure the generated module points to our own @stylable/runtime copy
  // this allows @stylable/jest to be used as part of a globally installed CLI
  - { runtimePath: require.resolve('@stylable/runtime'), ...factoryOptions }
  + { runtimePath: stylableRuntimePath, ...factoryOptions }
  );
  }
  export const process = processFactory();
  +
  +export function getCacheKey(
  + fileData: string,
  + filename: string,
  + configString: string,
  + { instrument }: { instrument: boolean }
  +) {
  + return (
  + fileData + configString + (instrument ? 'instrument' : '') + filename + stylableRuntimePath
  + );
  +}
  