To help make our GitHub Actions easier to understand, we're planning to
split the existing `ci.yml` into three separate workflows:

* run_bundling.yml (this PR)
* run_tests.yml 
* make_release.yml

To avoid the duplication that this might otherwise cause, we're planning
to write the workflows with gh-workflow, and use rust instead of
encoding logic in YAML conditions.

Release Notes:

- N/A

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Co-authored-by: Ben Kunkle <ben@zed.dev>