feat: add more fail2ban matches

[staaldraad]

Summary by CodeRabbit

• New Features
  • Enhanced detection of pgbouncer authentication and login failures in security monitoring, including improved error pattern recognition for user authentication issues, pooler errors, and database login failures.

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[coderabbitai]

Walkthrough

This change updates the pgbouncer fail2ban filter configuration template by adding an Init section with a maxlines constraint and three new failregex patterns to detect password authentication failures, missing user errors, and database validation failures in pgbouncer logs.

Changes

Cohort / File(s)	Summary
Fail2ban pgbouncer filter configuration ansible/files/fail2ban_config/filter-pgbouncer.conf.j2	Added Init section with maxlines = 3 and three new failregex patterns for detecting pgbouncer authentication errors (password failures, missing users, database validation failures). Existing journalmatch targeting pgbouncer.service unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No pull request description was provided by the author, but the description template indicates required sections should be filled out.	Add a detailed pull request description following the repository template, explaining the purpose of the new fail2ban matches and which errors they address.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: add more fail2ban matches' is directly related to the changeset, which adds new failregex patterns to a fail2ban filter configuration file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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