feat: add eject command

[yannbf]

Issue: #42

Running eject for the first time:

And in case the config file already exists, it will notify the user (but still override it without prompting)

Improvement points/challenges for later

• Using the test-runner in monorepos. Very likely the logic to detect and use the config file is not ready for that
• Adding inquirer or any other library to allow for prompting user to things like (are you sure you want to override ; we detected an external storybook url, do you want to use stories-json flag)

📦 Published PR as canary version: 0.0.3-canary.54.04b73e7.0

✨ Test out this PR locally via:

npm install @storybook/test-runner@0.0.3-canary.54.04b73e7.0
# or 
yarn add @storybook/test-runner@0.0.3-canary.54.04b73e7.0

Version

Published prerelease version: v0.0.3-next.4

Changelog

🐛 Bug Fix

• feat: add eject command #54 (@yannbf)
• Test-runner file for hook configuration #53 (@shilman)
• feat: add update snapshot command to cli #52 (@yannbf)
• fix: improve error message in start-storybook #51 (@yannbf)
• Respect stories defined in main.js #46 (@yannbf)

Authors: 2

• Michael Shilman (@shilman)
• Yann Braga (@yannbf)

[shilman]

LGTM! 🚀

[shilman]

print file location? @yannbf