Error installing CLI without a pinned release

[kasperg]

When trying to install the Upsun CLI in platform.app.yml we get the following errors. Pinning to the latest release v5.10.3 fixes the issue.

    +------------------------------------------------+
    |                                                |
    |              Upsun CLI Installer               |
    |                                                |
    +------------------------------------------------+
    
    Checking environment
      [*] Your kernel (linux) is supported
      [*] Your architecture (amd64) is supported
      [*] Using raw install method
      [*] cURL is installed
      [ ] ERROR: Could not determine CLI version
    +------------------------------------------------+
    |                                                |
    |              Installation failed               |
    |                                                |
    +------------------------------------------------+
    
    Get help with your Upsun CLI installation:
      Inspect the logs: /tmp/upsun-install-20260511-104158.log
      Read the docs: https://docs.upsun.com/administration/cli.html
      Get help: https://upsun.com/contact

Reference:

• Project: 7nxs2d263ym32
• ID: l2bsosh3hegi2