This removes all the remaining references to the `build2` directory
except for the CI job that stores the artifacts. We'll keep the
`build2` artifact until downstream scripts are migrated to `build`.
Since we track these versions in source, we can build `@latest`
releases in CI and store them as artifacts.
Then when it's time to release, and the build has been verified, we use
`prepare-release-from-ci` (the same script we use for `@next` and
`@experimental`) to fetch the already built and versioned packages.
Also update instructions to match recent script changes.
Also add reproducible commit SHA to post download instructions to support publishing the Firefox DevTools extension.
* Migrate prepare-release-from-ci to new workflow
I added a `--releaseChannel (-r)` argument to script. You must choose
either "stable" or "experimental", because every build job now includes
both channels.
The prepare-release-from-npm script is unchanged since those releases
are downloaded from npm, nt CI.
(As a side note, I think we should start preparing semver releases using
the prepare-release-from-ci script, too, and get rid of
prepare-release-from-npm. I think that was a neat idea originally but
because we already run `npm pack` before storing the artifacts in CI,
there's really not much additional safety; the only safeguard it adds is
the requirement that a "next" release must have already been published.)
* Move validation to parse-params module
* Updated DevTools local development instructions to mention experimental build step
* Added a command to download latest experimental release (for DevTools)
* Updated build instructions for clarity
* Added build-for-devtools package alias
