fix: use dehydrated role for nginx setup

[DecFox]

It seems that the ooni-backend playbook is a buggy since it tries to setup nginx twice with conflicting users. This diff should fix it.

[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: monitoring.ooni.org
[WARNING]: Could not match supplied host pattern, ignoring: backend-
hel.ooni.org
[WARNING]: Could not match supplied host pattern, ignoring:
clickhouseproxy.dev.ooni.io
[WARNING]: Could not match supplied host pattern, ignoring:
clickhouseproxy.prod.ooni.io
[WARNING]: Could not match supplied host pattern, ignoring: notebook1.htz-
fsn.prod.ooni.nu
[WARNING]: Could not match supplied host pattern, ignoring: data1.htz-
fsn.prod.ooni.nu
[WARNING]: Could not match supplied host pattern, ignoring: data3.htz-
fsn.prod.ooni.nu
[WARNING]: Could not match supplied host pattern, ignoring: openvpn-
server1.ooni.io

PLAY [Ensure all hosts are bootstrapped correctly] *****************************
skipping: no hosts matched

PLAY [Deploy monitoring host] **************************************************
skipping: no hosts matched

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

PLAY [Deploy ooni backend services] ********************************************
skipping: no hosts matched

PLAY [Deploy clickhouse proxy] *************************************************
skipping: no hosts matched

PLAY [Deploy oonidata clickhouse hosts] ****************************************
skipping: no hosts matched

PLAY [Deploy airflow frontend host] ********************************************
skipping: no hosts matched

PLAY [Setup OpenVPN server] ****************************************************
skipping: no hosts matched

PLAY [Deploy notebook host] ****************************************************
skipping: no hosts matched

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

Pusher	@DecFox
Action	pull_request
Working Directory
Workflow	.github/workflows/check_ansible.yml
Last updated	Wed, 23 Jul 2025 09:18:28 GMT

[aagbsn]

I noticed that nginx gets set up twice as well.