Check if the `ORBIT_ENABLE_SCRIPTS` plist variable exists and set or add
it accordingly in the plist.
Prior to this change, if the variable was not already present on the
host, the script would fail to set the variable.
This change also sets the `plist_path` variable, which was missing in
the original script.
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.
## Testing
- [x] QA'd all new/changed functionality manually
## fleetd/orbit/Fleet Desktop
- [x] Verified compatibility with the latest released version of Fleet
(see [Must
rule](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/workflows/fleetd-development-and-release-strategy.md))
- [x] Verified that fleetd runs on macOS, Linux and Windows
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Chores**
* Improved macOS setup script to more reliably configure the launchd
environment variable: it now detects whether the variable exists before
updating or adding it, handles errors silently during probes, uses a
single plist path variable instead of a hardcoded path, and ensures the
service is restarted with the updated configuration.
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/fleetdm/fleet/pull/46100?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)
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<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Mason Buettner
6abc217c76
