Remove GDAL install from Copilot setup workflow

[Copilot]

This PR removes the GDAL installation from the Copilot setup workflow. The setup now provisions only the tooling needed for repository bootstrap and hook installation.

• Workflow change

  • Updated .github/workflows/copilot-setup-steps.yml to delete the Install GDAL step.
  • Kept all other setup steps unchanged (checkout, setup-uv, prek install).

• Net effect

  • Copilot setup no longer runs apt-based GDAL provisioning during workflow execution.

# removed from copilot-setup-steps.yml
- name: Install GDAL
  run: |
    sudo apt-get update -qy
    sudo apt-get install -qy -o APT::Install-Suggests=false gdal-bin

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:

• mirrors.aliyun.com
  • Triggering command: /home/REDACTED/work/reformatters/reformatters/.venv/bin/prek /home/REDACTED/work/reformatters/reformatters/.venv/bin/prek hook-impl --hook-dir /home/REDACTED/work/reformatters/reformatters/.git/hooks --script-version 4 --hook-type=pre-commit -- (dns block)
• mirrors.cloud.tencent.com
  • Triggering command: /home/REDACTED/work/reformatters/reformatters/.venv/bin/prek /home/REDACTED/work/reformatters/reformatters/.venv/bin/prek hook-impl --hook-dir /home/REDACTED/work/reformatters/reformatters/.git/hooks --script-version 4 --hook-type=pre-commit -- (dns block)
• pypi.tuna.tsinghua.edu.cn
  • Triggering command: /home/REDACTED/work/reformatters/reformatters/.venv/bin/prek /home/REDACTED/work/reformatters/reformatters/.venv/bin/prek hook-impl --hook-dir /home/REDACTED/work/reformatters/reformatters/.git/hooks --script-version 4 --hook-type=pre-commit -- (dns 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)

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