PR title checker should reject placeholder JIRA keys like LCORE-0000 #3069

What happened

PR #3053 used the title LCORE-0000: Fix konflux build and passed the pr-title-checker CI gate. The review agent flagged this as a [low] missing-authorization finding, noting the placeholder JIRA key. The current .github/pr-title-checker-config.json uses a prefix-based check (LCORE-, RSPEED-, etc.) that matches any string starting with the prefix, including invalid keys like LCORE-0000, LCORE-, or LCORE-abc. PR #3053 was ultimately closed without merging, but the same placeholder was also used on PRs #3035 and #3048, showing this is a recurring pattern.

What could go better

The PR title checker should enforce that the JIRA key contains a valid issue number (non-zero integer), not just match a prefix string. This would catch placeholder keys deterministically at CI time instead of relying on agent review to flag them. Confidence: high — the pr-title-checker GitHub Action supports regexp checks in addition to prefix checks, making this a simple config change. The AGENTS.md already states that CI enforces JIRA prefixes, so tightening the validation aligns with existing intent.

Proposed change

In .github/pr-title-checker-config.json, replace the prefixes array with a regexp pattern that requires a valid JIRA issue number (one or more digits, not all zeros) after the project prefix. For example:

{
  "CHECKS": {
    "regexp": "^(LCORE|RSPEED|MGTM|OLS|RHIDP|LEADS|CWFHEALTH)-[1-9]\\d*[: ]|^\\[release/"
  }
}

This rejects LCORE-0000, LCORE-0, and LCORE-abc while accepting LCORE-5106, RSPEED-2849, etc. The [release/ prefix continues to work via the alternation.

Validation criteria

After the config change: (1) a PR titled LCORE-0000: test should fail the title check, (2) a PR titled LCORE-5106: test should pass, (3) a PR titled [release/0.8] test should pass. Verify by opening a test PR or checking the pr-title-checker action documentation for local validation.

Related issues checked

Searched: LCORE-0000 placeholder pr title; pr title checker JIRA placeholder validation
No overlapping issues found.

Generated by retro agent from #3053