feat: use galaxy module to configure sshd

[DecFox]

This is part of the work being done in #27.

This diff adds support for using the ansible galaxy module ((ansible-sshd){https://github.com/willshersystems/ansible-sshd}) to configure sshd on the ansible-controller and other hosts (all hosts using the ssh_users role)

[github-actions]

Ansible Run Output 🤖

Ansible Playbook Recap 🔍

Ansible playbook output 📖success

Show Execution

$ ansible-playbook playbook.yml --check --diff -i ../tf/modules/ansible_inventory/inventories/inventory-dev.ini
[WARNING]: provided hosts list is empty, only localhost is available. Note that
the implicit localhost does not match 'all'
[WARNING]: Could not match supplied host pattern, ignoring: clickhouse_servers
[WARNING]: Could not match supplied host pattern, ignoring: monitoring.ooni.org

PLAY [ClickHouse servers] ******************************************************
skipping: no hosts matched

PLAY [Update monitoring config] ************************************************
skipping: no hosts matched

PLAY RECAP *********************************************************************

Pusher	@DecFox
Action	pull_request
Working Directory
Workflow	.github/workflows/check_ansible.yml
Last updated	Sun, 21 Jul 2024 13:37:46 GMT

[DecFox]

The diff till commit 831068f has been applied on backend-hel.ooni.org and ams-slack-1.ooni.org.

[hellais]

I will move forward with deploying this onto more hosts and land it into main. Thanks for working on it!