[chore] Improve release script by automating documentation update

[djhi]

Problem

There are still too many manual steps when releasing a new react-admin version.

Solution

Follow #10574

Automate one more step: updating the documentation automatically when possible:

• Copy the new doc to the react-admin-doc sibling directory if it exists
• Update the latest version in react-admin-doc/_data/versions.yml
• Add a new minor entry if necessary in react-admin-doc/_data/versions.yml

You can override the documentation directory path by setting the RA_DOC_PATH environment variable.

How To Test

These scripts support a RELEASE_DRY_RUN env variable allowing to skip all mutations to git, GitHub or npm, except 1 git commit (but not pushed!) from lerna.

First, create a .env file from the .env.template file and fill it in with your Github token.

Then run:

RELEASE_DRY_RUN=true make release

When this is done, don't forget to revert the commit created by lerna to update the versions:

git reset --hard HEAD~1

Additional Checks

• The PR targets master for a bugfix, or next for a feature