This passing of Watchman socket was implemented in order to avoid this:
```
Error: EMFILE: too many open files, watch
at FSEvent.FSWatcher._handle.onchange (node:internal/fs/watchers:204:21)
Emitted 'error' event on NodeWatcher instance at:
at NodeWatcher.checkedEmitError (/private/tmp/nix-build-status-mobile-build-nightly-android.drv-0/node_modules/sane/src/node_watcher.js:143:12)
at FSWatcher.emit (node:events:527:28)
at FSEvent.FSWatcher._handle.onchange (node:internal/fs/watchers:210:12) {
errno: -24,
syscall: 'watch',
code: 'EMFILE',
filename: null
}
```
Which is caused by `jest-haste-map` used by `metro` starting to watch
the filesystem for file changes, which is pointless when doing a
one-off build using Nix.
But by setting `CI=true` we can make `metro` not start this waching of
files in the first place, removing the need for use of Watchman entirely.
By entirely dropping use of Watchman we also fix the following issue:
```
[cli] unable to talk to your watchman on /tmp/tmp-status-mobile-ABC/jenkins-state/sock! (Permission denied)
```
Which happens on multi-user Nix installations becuase the user that the
Nix build is executed as is not the same as the user that starts
Watchman and creates the socket file.
Issue: https://github.com/status-im/status-mobile/issues/13783
Signed-off-by: Jakub Sokołowski <jakub@status.im>
Jakub Sokołowski
5903cf73fb