add provision_celery and celery service files for local and prod

[paigewilliams]

discovered while deploying to demo.itkdb.org. Main changes are changing the APP_USER=ubuntu on prod, and setting, ExecStart=/usr/local/apps/TEKDB/env/bin/celery

[Copilot]

Pull request overview

Adds systemd unit files and provisioning scripts to run Celery worker/beat for TEKDB in both local (vagrant) and production environments, aligning deployment with the discovered requirements on demo.itkdb.org.

Changes:

• Added systemd service unit files for Celery worker/beat in local and prod variants.
• Added provisioning scripts to install Redis, install/copy systemd units, and enable/start Celery services.

Reviewed changes

Copilot reviewed 3 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
deployment/celery-worker.prod.service	Adds prod systemd unit for Celery worker using the TEKDB virtualenv celery binary.
deployment/celery-worker.local.service	Adds local systemd unit for Celery worker (currently references a different venv path than the rest of the repo).
deployment/celery-beat.prod.service	Adds prod systemd unit for Celery beat with DatabaseScheduler.
deployment/celery-beat.local.service	Adds local systemd unit for Celery beat (currently references a different venv path than the rest of the repo).
TEKDB/scripts/provision_celery.prod.sh	Adds prod provisioning steps for Redis + systemd units (currently copies non-existent unit filenames).
TEKDB/scripts/provision_celery.local.sh	Adds local provisioning steps for Redis + systemd units (currently copies non-existent unit filenames).

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