Update Preinstalling tools or dependencies in Copilot's environment Docs

[stephenfinch]

Add note to explain how the setup-steps yml file must live on your default branch for it to be triggered when copilot opens a PR

Why:

The documentation does not clearly explain that the agent-setup-steps.yml file must live on the default branch in order for it to run before copilot starts working on a PR.

What's being changed (if available, include any code snippets, screenshots, or gifs):

Added a note to the docs page for https://docs.github.com/en/copilot/how-tos/manage-and-track-spending/monitor-premium-requests to explain that the yml file must be on the default branch.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[Copilot]

Pull Request Overview

This PR adds a critical note to the Copilot agent environment customization documentation to clarify that the copilot-setup-steps.yml file must be merged into the default branch to function properly when Copilot opens a PR.

Key Changes

• Added a note explaining the default branch requirement for the setup steps file
• Clarifies when the setup steps will be triggered in the Copilot workflow

[github-actions]

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
copilot/how-tos/use-copilot-agents/coding-agent/customize-the-agent-environment.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[Sharra-writes]

@stephenfinch Thanks for opening a PR! I will get this triaged for review.

[stephenfinch]

@stephenfinch Thanks for opening a PR! I will get this triaged for review.

Thanks for that. Is there anything else I need to do before this can be reviewed?

[Sharra-writes]

@stephenfinch Nope, you're good! It just takes SMEs a while to get back to me sometimes. Luckily this is a small enough change that I can probably review the writing part myself, which is the step that has been taking the longest recently, since the rest of the team is involved in a huge project.

[Sharra-writes]

@stephenfinch I got the SME review and it looks good, so now I just need to make sure the phrasing matches our style guide.

[stephenfinch]

@stephenfinch I got the SME review and it looks good, so now I just need to make sure the phrasing matches our style guide.

Awesome! I looked at the suggestion to the wording and it looked good to me so I committed it.

[Sharra-writes]

@stephenfinch Got it added to the merge queue. 🎉 We've been having some on-and-off trouble with the linter, but 🤞 it will just merge without any problems.

[github-actions]

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