Add celery worker and celery beat

Dockerfile

build/lib/gso/__init__.py

build/lib/gso/alembic.ini

build/lib/gso/api/__init__.py

build/lib/gso/api/v1/__init__.py

build/lib/gso/api/v1/imports.py

build/lib/gso/api/v1/subscriptions.py

build/lib/gso/cli/__init__.py

build/lib/gso/cli/import_sites.py

build/lib/gso/cli/netbox.py

build/lib/gso/main.py

build/lib/gso/migrations/env.py

build/lib/gso/migrations/helpers.py

build/lib/gso/migrations/script.py.mako

.../versions/2023-08-14_3657611f0dfc_add_router_workflows.py

...ns/versions/2023-08-14_91047dd30b40_add_site_workflows.py

.../versions/2023-08-14_97436160a422_add_initial_products.py

...ersions/2023-08-14_a6eefd32c4f7_add_ip_trunk_workflows.py

...023-08-16_e68720f2ec32_add_ip_trunk_migration_workflow.py

...versions/2023-08-23_01e42c100448_update_ip_trunk_model.py