You can now specify what environment you are building
by add it to the `yarn build` command. For example:
```
yarn build -- --env=stage
```
Moreover the `deploy-to-firebase.sh` script will automatically apply the
appropriate environment.
The current stable branch is determined based on the current version mapped to
the npm `latest` tag (by replacing the patch version number with 'x' - e.g.
`1.2.3` --> `1.2.x`).
PRs against the stable branch will be deployed to the preview server (as long as
the rest of the requirements are met). Commits on the stable branch itself will
be deployed to production.
Fixes#16908