ci: build the snap on self-hosted runners #91

Job	Run time
lint / files	47s
test / Minimum dependencies (all tests)	10m 11s
test / Fast tests (jammy, amd64)	4m 26s
test / Fast tests (noble, amd64)	5m 17s
test / Slow tests (noble, 3.10)	9m 28s
test / Fast tests (macos-13)	9m 33s
test / Slow tests (macos-14-large, 3.10)	5m 58s
test / Fast tests (macos-14-large)	8m 12s
test / Fast tests (windows-2019)	6m 24s
test / Fast tests (windows-2022)	6m 34s
	1h 6m 50s

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