feat: Add more ELPA; including devel channels #717

Job	Run time
test (ubuntu-latest, 26.3, false)	1m 8s
test (ubuntu-latest, 27.2, false)	1m 1s
test (ubuntu-latest, 28.2, false)	57s
test (ubuntu-latest, 29.1, false)	1m 7s
test (macos-latest, 26.3, false)	2m 47s
test (macos-latest, 27.2, false)	4m 49s
test (macos-latest, 28.2, false)	2m 53s
test (macos-latest, 29.1, false)	2m 47s
test (windows-latest, 26.3, false)	2m 4s
test (windows-latest, 27.2, false)	1m 23s
test (windows-latest, 28.2, false)	1m 29s
test (windows-latest, 29.1, false)	1m 21s
test (ubuntu-latest, snapshot, true)	50s
test (macos-latest, snapshot, true)	4m 54s
test (windows-latest, snapshot, true)	1m 2s
	30m 32s

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