CI: Enable proxy cache in test and build-docs pipelines

[Copilot]

This PR adds the setup-proxy-cache step to test workflows and the build-docs workflow as a follow-up to PR #555, which originally added proxy caching to build workflows. The proxy cache improves Python package download times during testing and documentation builds by caching packages closer to the runners.

Changes Made

Added the setup-proxy-cache step to workflows:

• .github/workflows/test-wheel-linux.yml - Added proxy cache setup (Linux-only, no conditional logic needed)
• .github/workflows/test-wheel-windows.yml - Added TODO comment for future Windows runner support
• .github/workflows/build-docs.yml - Added proxy cache setup to speed up conda/pip package downloads

The implementation follows the exact same pattern established in PR #555:

- name: Setup proxy cache
  uses: nv-gha-runners/setup-proxy-cache@main
  continue-on-error: true

Key Features

• Consistent with build workflows: Uses identical action reference and error handling
• Proper placement: Added after checkout but before any dependency installation steps
• Platform-aware: Linux workflows use proxy cache, Windows workflow includes TODO for future support
• Fail-safe: Uses continue-on-error: true to ensure cache failures don't break pipelines
• Documentation builds: Speeds up conda environment setup and package installations

Benefits

• Faster test execution due to reduced Python package download times
• Improved reliability for test pipelines that download lots of wheels
• Faster documentation builds with reduced conda package download times
• Consistent caching strategy across build, test, and documentation workflows

Fixes #812.

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[leofang]

/ok to test 6325eb8

[leofang]

@copilot looking good! Could you please also add the same action to this workflow .github/workflows/build-docs.yml? There's a TODO on caching which would become obsolete if we set up the proxy.

[Copilot]

@copilot looking good! Could you please also add the same action to this workflow .github/workflows/build-docs.yml? There's a TODO on caching which would become obsolete if we set up the proxy.

Added the setup-proxy-cache action to build-docs.yml workflow and removed the obsolete TODO about conda caching since the proxy cache addresses package download performance. 77d14da

[leofang]

/ok to test 77d14da

[kkraus14]

Should we pin this to a specific commit?

[leofang]

Ah, sorry Keith, I set automerge so did not get a chance to reply before merging. I think the bot just followed what Marcus did earlier. It seems everyone pins at main too: https://github.com/search?q=setup-proxy-cache+language%3Ayaml+NOT+is%3Afork&type=code

[kkraus14]

+1

[github-actions]

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