Add nightly ci dispatcher and update README #1086

Job	Run time
reusable_tests / asan	3m 32s
reusable_tests / docs	59s
reusable_tests / clang	2m 3s
reusable_tests / coverage	3m 42s
reusable_tests / flaky	1m 48s
reusable_tests / python-linter	12s
reusable_tests / multiplatform-tests (Release, ubuntu-22.04)	3m 56s
reusable_tests / tsan	3m 59s
reusable_tests / multiplatform-tests (Release, ubuntu-24.04)	3m 26s
reusable_tests / uncrustify	37s
reusable_tests / multiplatform-tests (Release, windows-2019)	13m 59s
reusable_tests / multiplatform-tests (Release, windows-2022)	14m 8s
reusable_tests / multiplatform-tests (Debug, ubuntu-22.04)	3m 49s
reusable_tests / multiplatform-tests (Debug, ubuntu-24.04)	4m 2s
reusable_tests / multiplatform-tests (Debug, windows-2019)	12m 15s
reusable_tests / multiplatform-tests (Debug, windows-2022)	10m 34s
	1h 23m 1s

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