Run ansible script without an inventory file

You can run playbooks against an ad-hoc server by using a trailing comma with an ip address:

ansible-playbook -i 172.20.221.131, pg.yml

# pg.yml
---
- hosts: all
  remote_user: dillon
  gather_facts: no
  vars:
    postgres_user: dillon
    postgres_db: rails_app_development
    pg_version: 15
    ...

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