renovate: Add config to scan common/ for GitHub Actions

[cgwalters]

Renovate was updating GitHub Actions versions in target repositories but not in the common/ directory of this infra repo. This created a reconciliation loop where sync-common would overwrite Renovate's updates with older versions from common/.

Add renovate.json with explicit fileMatch patterns for the github-actions manager to scan both workflows and composite actions under common/.github/.

Fixes: bootc-dev/bootc#1865 (comment)

Assisted-by: OpenCode (Sonnet 4)

[gemini-code-assist]

Summary of Changes

Hello @cgwalters, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical dependency management issue by configuring Renovate to properly scan and update GitHub Actions versions within the common/ directory. Previously, Renovate was not detecting these actions, leading to conflicts and outdated dependencies when sync-common processes ran. The addition of a dedicated renovate.json file with specific fileMatch patterns ensures that GitHub Actions workflows and composite actions are now correctly managed, thereby preventing version discrepancies and maintaining a consistent, up-to-date infrastructure.

Highlights

• Renovate Configuration: Introduced a new renovate.json file to explicitly configure Renovate to scan GitHub Actions workflows and composite actions located within the .github/workflows and .github/actions directories under common/.
• Issue Resolution: This change resolves a reconciliation loop where sync-common would overwrite Renovate's updates with older versions from the common/ directory, ensuring consistent dependency management for GitHub Actions.

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[gemini-code-assist]

Code Review

This pull request aims to configure Renovate to scan for GitHub Actions in the common/ directory. I've found two critical issues in the new renovate.json configuration. First, the extends path for the shared configuration is invalid and will likely cause Renovate to fail. Second, the fileMatch regular expressions do not correctly target the files within the common/ directory and also might be too permissive. My review includes suggestions to fix both of these issues to ensure the configuration works as intended.

[gursewak1997]

lgmt