Fail2ban support

[ghost]

SUMMARY

This PR adds the audit module, patches it to include IPs and includes a fail2ban rule.

ISSUE TYPE

• Feature Pull Request

[ghost]

The patching was removed as we now use our own fork.

[s3lph]

The CI is currently failing because the ansible-lint action changed its name; it must now be included as:

uses: ansible/ansible-lint@main

Please update accordingly in .github/workflows/ansible-ci.yml

[s3lph]

Depends on adfinis-forks/icingaweb2-module-audit#1 merged

[s3lph]

The CI currently fails as ansible-lint has some fairly limited expectations about where the repository is checked out: ansible/ansible-lint#3938

For this repo, I think it's easiest if we check out icinga2_web without using a subdirectory (the lint rules can still be checked out in a subdirectory).

[s3lph]

L172 also needs to be updated, but of course Github doesn't allow me to provide a suggestion there:

- hosts: servers
  roles:
    - { role: adfinis.icinga2_web }

[ghost]

L172 also needs to be updated, but of course Github doesn't allow me to provide a suggestion there:

- hosts: servers
  roles:
    - { role: adfinis.icinga2_web }

Done.

[s3lph]

LGTM