wp now: add codespaces support

[sejas]

What

Allow running wp-now in any GitHub codespace, even in the default one.

• It does not fix it but it's related to VScode.dev plugin #8

How

• Avoid crashing if we cannot open the browser
• Skip opening the browser for codespaces
• Change the default URL for codespaces which uses port forwarding

Why

It improves the dev experience and makes it easier to develop WordPress themes and plugins directly from the repo.
It will be great for contributors day.

Testing steps

• Go to this branch https://github.com/WordPress/playground-tools/tree/add/wp-now-codespaces-support
• Click on Code > Create codespace

• Run these commands:

git checkout add/wp-now-codespaces-support
nvm install 18.13.0
nvm use 18.13.0
npm install
npx nx build wp-now && node dist/packages/wp-now/main.js start

• Click on the printed URL or popup to open the browser. This URL is also available in the ports tab.
• Observe you can access your WordPress instance.
• After this branch is deployed and we release a new wp-now version on npm we can try it on Gutenberg or core repositories.

Screencast

wp-now.codespaces.mp4

[kozer]

Tested and it seems that works as expected:

• I successfully build wp-now
• The URL was successfully generated
• I followed the link and the port forwarding worked as expected. The site worked as expected.