CI:セットアップ

Update Node.js CI workflow

Refactored the node.js CI workflow to streamline steps and organize them under the 'app' directory. Removed extraneous comments for clarity and added working-directory parameter to relevant steps for better directory management.

app/jest.config.cjs

@@ -21,6 +21,5 @@ module.exports = {
     moduleNameMapper: {
         '\\.(css|scss)$': 'identity-obj-proxy',
         "\\.(gif|ttf|eot|svg|png)$": "<rootDir>/test/__mocks__/fileMock.js",
-        uuid: require.resolve('uuid'),
     },
 };