test: CI backend needs to be system-specific
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Issue body
### Bug Description
https://github.com/canonical/craft-application/commit/d4a3eb919867d94eaae7522c6f1cf658ee9557d8
### To Reproduce
https://github.com/canonical/craft-application/commit/d4a3eb919867d94eaae7522c6f1cf658ee9557d8
### part yaml
```shell
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### Relevant log output
```shell
n/a
```
Evaluation history
No evaluation history available.