fix vastai fit loop iteration direction

[DSFans2014]

What type of PR is this?

What this PR does / why we need it:

• fix vastai fit loop iteration direction

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[gemini-code-assist]

Summary of Changes

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This pull request addresses a bug in the device fitting logic by reversing the iteration order of devices. This ensures that the Fit function correctly processes available devices, leading to the intended device selection. A corresponding test case has been updated to validate this corrected behavior.

Highlights

• Loop Iteration Direction: Corrected the iteration direction in the Fit function within pkg/device/vastai/device.go from a forward loop to a backward loop.
• Test Case Update: Updated an existing test case in pkg/device/vastai/device_test.go to reflect the correct expected device ID (dev-1 instead of dev-0) after the logic change.

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[gemini-code-assist]

Code Review

This pull request modifies the device fitting logic in pkg/device/vastai/device.go by reversing the iteration order of the devices slice. A related test case in pkg/device/vastai/device_test.go was updated to reflect a change in expected device IDs. A critical issue was identified where the devices slice might contain nil elements, leading to a panic when dereferenced, and a nil check was suggested as an improvement.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
unittests	51.90% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/device/vastai/device.go	74.87% <100.00%> (-0.13%)	⬇️

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[archlitchi]

Is it done, have you tested?

[DSFans2014]

Is it done, have you tested?

The device selected by the following test using Fit is the second device, which indicates that the traversal is done in reverse order.
https://github.com/DSFans2014/HAMi/blob/c447cabef6221777aa31fdc38e61865f61f2bf21/pkg/device/vastai/device_test.go#L576-L618

[Shouren]

/lgtm

[hami-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DSFans2014, FouoF

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