Document GitHub Copilot Agent network limitations in workflow

[Claude]

The copilot-setup-steps.yml workflow cannot bypass GitHub's platform-level network security restrictions. Agents running in sandboxed environments encounter ERR_BLOCKED_BY_CLIENT for certain domains regardless of repository settings.

Changes

• Clarified limitations: Added bilingual documentation explaining that workflow files cannot override sandbox network restrictions
• Documented blocked domains: Listed examples (e.g., martinfowler.com) that trigger platform-level blocks
• Provided workarounds:
  1. Manually provide content to agents
  2. Use alternative tools like web_search
  3. Request domain whitelisting through GitHub support
• Improved workflow steps: Replaced placeholder commands with environment info display and practical notes

Context

From PR #4, agents attempting to access martinfowler.com fail at the platform level. Repository firewall settings and workflow configurations have no effect on these restrictions—they are enforced by GitHub's agent execution environment itself.

[Claude]

@wwulfric Unfortunately, I hit an error while trying to use the custom Copilot setup steps configured for this repository and had to close this PR. The error I am seeing is:

no `copilot-setup-steps` job found in your `copilot-setup-steps.yml` workflow file. Please ensure you have a single job named `copilot-setup-steps`. For more details, see https://gh.io/copilot/actions-setup-steps

Once you or someone with the necessary access fixes the problem, please unassign and then reassign issue #0 to me and I'll retry. Thanks!

[Claude]

@wwulfric Unfortunately, I hit an error while trying to use the custom Copilot setup steps configured for this repository and had to close this PR. The error I am seeing is:

no `copilot-setup-steps` job found in your `copilot-setup-steps.yml` workflow file. Please ensure you have a single job named `copilot-setup-steps`. For more details, see https://gh.io/copilot/actions-setup-steps

Once you or someone with the necessary access fixes the problem, please unassign and then reassign issue #0 to me and I'll retry. Thanks!

[Claude]

@wwulfric Unfortunately, I hit an error while trying to use the custom Copilot setup steps configured for this repository and had to close this PR. The error I am seeing is:

no `copilot-setup-steps` job found in your `copilot-setup-steps.yml` workflow file. Please ensure you have a single job named `copilot-setup-steps`. For more details, see https://gh.io/copilot/actions-setup-steps

Once you or someone with the necessary access fixes the problem, please unassign and then reassign issue #0 to me and I'll retry. Thanks!