Automatically set calver version in changelog and package.json

[MitchLillie]

Background

Just an idea I had: https://shopify.slack.com/archives/C0683EBQ55M/p1727287021016169?thread_ts=1727285984.795059&cid=C0683EBQ55M

Solution

We add a script to be run after changeset version which should simplify step 5 of Creating new stable versions

🎩

1. Create a github personal access token with read:user and repo:status permissions. Copy its value.
2. In the list of PATs, select Configure SSO -> Authorize next to Shopify.
3. Checkout this branch, and then checkout a new branch from here with a valid name (YYYY-MM, so 2027-03, or whatever value you like).
4. In your terminal run GITHUB_TOKEN=<your token here> yarn calver - this simulates a new stable release created from unstable.
5. Check the package.json and CHANGELOG.md files in each of the packages/ subdirectories (the top-level package.json doesn't change). They should all have a version corresponding to your branch name. For example, if you chose 2027-03 as your branch you should see 2027.3.0.
6. Run GITHUB_TOKEN=<your token here> yarn calver - This simulates a patch release on a pre-existing stable release.
7. Check the package.json and CHANGELOG.md files again. You should see the patch number incremented by 1. For example, if you chose 2027-03 as your branch, and you saw 2027.3.0 in the previous step, it should now read 2027.3.1.

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation