Disable nightly builds #3077

Job	Run time
build (macos-latest)	14m 6s
build-api-and-doc	13m 43s
build (windows-latest)	16m 45s
build (ubuntu-22.04)	8m 2s
build-guest-rust (macos-latest)	1m 54s
build-guest-rust (windows-latest)	1m 53s
build-web	14m 26s
build-guest-rust (ubuntu-22.04)	41s
clippy	8m 10s
clippy-web	5m 59s
test-linux	12m 1s
golden-image-tests	5m 39s
test-new-package-works (macos-latest)	4m 29s
test-new-package-works (ubuntu-22.04)	1m 54s
	1h 49m 42s

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