chore: add CODEOWNERS

[netram-netizen]

💡 Summary

Adds .github/CODEOWNERS naming @FeedbackFruits/devops as the default owner for every path in this repo. No repo in the devsecops scope had a CODEOWNERS file, so review requests have been going to whoever the author happened to pick, and there was no recorded answer to who owns this code.

🛠️ What does this PR do?

• Owner is @FeedbackFruits/devops because a shared base container image — build/runtime infrastructure.
• Owner is a team, not an individual: a named person stalls review whenever they are away, and silently goes stale as people change roles. Team membership is already maintained in one place.
• A single global * rule rather than per-path ownership — this repo has no subtree with a genuinely different owner, and a one-line file stays correct as the tree moves.
• Merging this alone changes nothing enforceable. CODEOWNERS only gates merges once branch protection enables Require review from Code Owners; until then it just pre-fills reviewer suggestions. Flipping that switch is deliberately left out of this PR so the reviewer assignment can settle first.
• @FeedbackFruits/devops does not have write access to this repo yet, and GitHub will mark the entry invalid until it does. The grant is being handled separately — do not merge before it lands.

[netram-netizen]

Closing: CODEOWNERS auto-requests review from the whole owning team on every PR, with no document-only mode. That fan-out is more notification noise than the ownership signal is worth. Ownership is being recorded centrally in feedbackfruits-devsecops instead.