Add shared PR Format Check workflow

[bunnam988]

Summary

Adds a reusable pr-lint.yml shared workflow that validates PR title and description format across all component repos.

What it checks

Title format: TICKET-123 [TICKET-456] : brief description

• At least one valid ticket number required
• Multiple tickets supported (e.g. user-story + subtask: RDKCOM-5492 RDKBDEV-3336 : ...)

Description fields (all required, non-empty):

• Reason for change:
• Test Procedure:
• Risks: (value is freeform — e.g. Low / Medium / High)
• Priority: (value is freeform — e.g. P0 / P1 / P2)

Behavior

• ❌ Fails the check if title or description is missing/incomplete
• Posts a concise reminder comment on the PR
• Updates the existing comment on re-edit (no duplicates)
• Deletes the reminder comment automatically when the PR is fixed
• ✅ Passes silently when format is correct
• Works for both same-repo and fork PRs (pull_request_target)
• Gracefully skips on API failure (never crashes the pipeline)

Usage in component repos

Each repo adds a 9-line caller workflow:

name: PR Format Check
on:
  pull_request_target:
    types: [opened, edited]
jobs:
  lint:
    uses: rdkcentral/build_tools_workflows/.github/workflows/pr-lint.yml@develop

Tested

• Bad title + missing fields → ❌ fails + reminder comment posted
• Good title + empty fields → ❌ fails + reminder comment posted
• Fully correct format → ✅ passes, no comment
• PR fixed after reminder → comment auto-deleted
• Re-edit while already commented → comment updated, no duplicate
• Multiple ticket numbers → passes
• Bullet / bold / bullet+bold field formats → all detected
• Fork PRs → comment posted correctly

[Copilot]

Pull request overview

Adds a reusable GitHub Actions workflow (workflow_call) to lint PR title/body formatting and (when non-compliant) post a single reminder comment without blocking merges.

Changes:

• Introduces .github/workflows/pr-lint.yml reusable workflow to validate PR title ticket format and required PR description fields.
• Adds logic to post a one-time “PR Format Reminder” comment when formatting issues are detected.

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