Auto-run npm run bootstrap on Submodule Commit

[martyanovandrey]

Problem:
Whenever you make changes to a metapackage, you need to make sure that it will still collect all nested gitmodules and assemble correctly. If changes occur within submodules, it is crucial to ensure that the metapackage remains functional and integrative with updated submodules.

Proposed solution:
Set up a GitHub Action that triggers when a commit is made to any of the repositories listed in the .gitmodules file. This action should:

1. Clone the metapackage repository.
2. Run npm run bootstrap within the metapackage.
3. Verify that everything has assembled correctly.

Steps to Implement:

1. Create a GitHub Action workflow file (.github/workflows/bootstrap.yml).
2. Set up triggers for the action based on updates to the submodules.
3. Define steps to clone the repo, run npm run bootstrap, and validate the build.