Update Gai AppImage URL to version 1.2.4

[huanguan1978]

1.2.4

• support Gemini 3.0 Flash preview.
• support Gemini 2.5 Flash image generation.
• support Imagen 4.0 generate (usagemode: serveonly).
• support uploading large files and storing them for 48 hours.
• support secure tunneling for geo-blocking bypass (usagemode: forwardonly).
• remove Gemini 2.0 models are now shut down.

[huanguan1978]

Dear @probonopd ,

I'm submitting an update package for an existing application to appimage.github.io. The CI workflow tests are failing with a Process completed with exit code 1. message, and all checks are reported as failed.

Upon detailed inspection of the job logs (URL: https://github.com/AppImage/appimage.github.io/actions/runs/20563205625/job/59056792935?pr=3623), I observe that the workflow successfully installed and executed my application binary. Crucially, the process reached and completed the LISTING FILES and EXPORTING DATA stages. This indicates that the application itself is functioning as expected and is capable of executing within the CI environment.

Given that the application executes successfully up to these critical stages, I am perplexed by the exit code 1 and the subsequent test failures. It suggests that the issue might not be with the application's core functionality but potentially with the build or deployment process within the CI pipeline.

Could you please provide guidance on how to diagnose and resolve this specific exit code 1 failure, considering the successful application execution observed in the logs?