ci: add prerelease process

[btaillon-coveo]

https://coveord.atlassian.net/browse/KIT-2150

Divided & adapted from: #2553

We're not migrating the normal release process yet since I'm running out of time.

New prerelease process

Look at the README.md to know the new release process:

ui-kit/README.md

Lines 57 to 81 in 49021bb

	## Prerelease
	### To start a major prerelease (e.g., `1.2.3` → `2.0.0-pre.0`)
	1. Make sure that `HEAD` refers to a version bump on `master`.
	2. Create a new branch prefixed with `prerelease/` (e.g., `prerelease/headless_atomic_v2`).
	3. Run `npm run bump:version:major-prerelease -- @coveo/package1 @coveo/package2 @coveo/package3`.
	4. Push the new commit and its tags to the branch.
	### Adding a new package to an already started prerelease
	1. Checkout the prerelease branch.
	2. Run `npm run bump:version:major-prerelease -- @coveo/package1` where `@coveo/package1` is the new package.
	3. Push the new commit and its tags to the branch.
	### Updating a prerelease branch
	1. Wait for `master` to reference a version bump.
	2. Pull changes from `master` into the prerelease branch.
	### Officially releasing (e.g., `2.0.0-pre.15` → `2.0.0`)
	1. Create a pull request from the prerelease branch to “master”.
	* Associate with a Jira issue which QA will use to validate.
	* Update the changelogs manually, adding all the changes from the last release to the new release.
	* Update all dependents to use the prerelease version (include the `-pre.` suffix).
	2. Wait for `master` to reference a version bump.
	3. Squash as a version bump.
	* You can copy the title & description of the last version bump commit on the prerelease branch.
	* You must add the link to the Jira issue at the beginning of the description.

Changes in this PR

1. Added a bump:version:major-prerelease script to the root package.json
   • This script will create a major prerelease version bump on the current branch, and will give it all the appropriate tags, but won't push it.
   • The commit will contain the same message that lerna gives version bumps, including [skip-ci].
   • Changelogs aren't updated.
2. Non-bump commits on a prerelease/** branch now trigger the same CI as master, except:
   • Only packages matching /pre\.[0-9]+$/ are upgraded.
     • If a dependent is out of scope (doesn't match the above version pattern), its dependencies won't be upgraded.
   • Changelogs aren't updated.
3. Bump commits on a prerelease/** branch now trigger the same CI as master, except:
   • Only packages matching /pre\.[0-9]+$/ are published to NPM.
   • The alpha tag on NPM isn't updated.
   • The package rollout stops at the dev environment.

Other details

• Packages are going to be published to the CDN based on their major/minor/patch version, the prerelease version will be ignored. Therefor, 2.0.0 will already be available on the dev CDN, and will be overwritten every time we update the prerelease. Out of scope packages will also update their CDN, but in theory the files should be the same anyway.
  • For example, @coveo/headless@2.0.0-pre.2 would exclusively be uploaded to the following in the CDN:
    • https://staticdev.cloud.coveo.com/headless/v2.0/headless.esm.js
    • https://staticdev.cloud.coveo.com/headless/v2.0.0/headless.esm.js

[github-actions]

Pull Request Report

PR Title

✅ Title follows the conventional commit spec.

Bundle Size

File	Old (kb)	New (kb)	Change (%)
case-assist	216.1	216.1	0
search	312.2	312.2	0
insight	258.2	258.2	0
product-listing	229.6	229.6	0
product-recommendation	213.8	213.8	0
recommendation	213.9	213.9	0

[ThibodeauJF]

Just making sure that this branch should be merged in master first #2556 (before merging this one) We could also trying out the dep pipeline as soon as its merged

[btaillon-coveo]

TODO: also bump versions in private packages

Update: I'm not gonna bump private packages, since it looks like the CI didn't bump them in the first place, and it makes npm install fail. Manually updating package-lock.json doesn't resolve the issue.

[louis-bompart]

lgtm overall, tho I don't know/understand all the process because well I'm not familiar with it