Require all builds passing before merging

[terrytangyuan]

🚀 Describe the new functionality needed

We should require all builds passing before merging.

💡 Why is this needed? What if we don't build it?

To avoid merging PRs like https://github.com/meta-llama/llama-stack/pull/1650 without passing builds, which broke pre-commit check on main branch.

Other thoughts

No response