Add flags to keep GLR-W/S from being cleaned

[zjrgov]

🎫 Addresses issue: #39

Flags to skip worker/service cleanup.

🛠 Summary of changes

When triggering a manual pipeline you can add these variables to cleanup of workers and/or services. The variables are PRESERVE_WORKER, and PRESERVE_SERVICES respectively. The CUSTOM_ENV_… gets appended by the runner.

[zjrgov]

@rahearn yeah that's the idea--manual cleanup. The cleanup is relatively easy and much quicker.

The alternative right now is manually disabling cleanup in the script and redeploying the runner which is slow and global so potentially disruptive.

[zjrgov]

@rahearn feel OK with me expanding #34?

[rahearn]

@rahearn feel OK with me expanding #34?

Yes!