CI on SDK 3.1.0

[rpm/sailfishos-chum-gui-installer.spec] Use `ssu`'s new `%releaseMajorMinor` macro for SailfishOS ≥ 4.6.0 #80

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Jobs
- build
Run details
- Usage
- Workflow file

Run time

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Job	Run time
build	1m 8s
	1m 8s