Skip push workflows for Copilot PRs

[Copilot]

Copilot agents cannot view push workflow results during development, making those runs wasteful. This change skips push-triggered workflows when the actor is github-copilot[bot] while preserving pull_request workflows that Copilot can see.

Changes:

• Add conditional to main.yml CI job: if: ${{ github.event_name == 'pull_request' || github.actor != 'github-copilot[bot]' }}

Behavior:

• ✅ Pull request workflows run for all PRs (including Copilot's)
• ✅ Push workflows run for human developers
• ⏭️ Push workflows skipped for Copilot commits

Note: The copilot-setup-steps.yml workflow is intentionally left unchanged as it serves a special purpose.

• Fixes Only run pull_request workflows on Copilot tasks #662

Original prompt

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This section details on the original issue you should resolve

<issue_title>Only run pull_request workflows on Copilot tasks</issue_title>
<issue_description>The CI workflow(s) runs on each pushed commit and each pull request. The pull request runs are necessary because they run on the result of merging the pull request, while the push runs are useful during development and drafts. However, the Copilot Agent cannot start workflows without human permission, so it can't see the result of push runs during development. That makes the push runs pretty much useless to the agent. When the author of the pull request is Copilot, any on: push workflows should be skipped and only the on: pull_request workflow should be executed. This should free up a lot of wasted CI resources.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Only run pull_request workflows on Copilot tasks #662

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[jackfirth]

@copilot

[coveralls]

Pull Request Test Coverage Report for Build #34

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.003%) to 93.314%

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Totals
Change from base Build #23:	-0.003%
Covered Lines:	14292
Relevant Lines:	15316

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💛 - Coveralls