Respond to CI workflow question on hmac update PR

[Copilot]

User asked how to run CI for the hmac library update PR. Provided information about the automatic CI trigger mechanisms.

Changes

• Replied to comment explaining CI runs automatically on PR events (opened, synchronize, reopened, unlabeled)
• Documented the main CI workflows that execute: rust_tests, snippets_cpython, lint, wasm, exotic_targets
• Provided troubleshooting steps if CI doesn't trigger (check for skip:ci label, push new commit, or reopen PR)

No code changes were required as this was an informational question about the development workflow.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/graphql
  • Triggering command: /usr/bin/gh gh pr view --json number,headRefName (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)