[design] Make it possible to use explicitly fetched signature impleme… #1892

Job	Run time
address_ub_sanitizer	16m 3s
basic_clang	9m 1s
basic_gcc	9m 26s
check_docs	1m 42s
buildtest	11m 7s
check_update	1m 48s
check-ansi	4m 50s
enable_brotli_and_asan_ubsan	14m 43s
enable_brotli_dynamic	8m 43s
enable_brotli_and_zstd_dynamic	8m 37s
enable_non-default_options	7m 56s
enable_zstd_and_asan_ubsan	14m 11s
enable_zstd_dynamic	8m 42s
enable-tfo (ubuntu-latest)	8m 45s
external-test-cf-quiche	6m 42s
enable-tfo (macos-latest)	12m 54s
external-test-pyca (1.51.0, 3.9)	11m 44s
external-tests	14m 41s
fips_and_ktls	11m 12s
legacy	7m 57s
memory_sanitizer	19m 25s
minimal	3m 48s
no-deprecated	8m 40s
no-legacy	8m 52s
non-caching	20m 28s
no-shared (ubuntu-latest)	6m 58s
out-of-source-and-install (ubuntu-latest)	15m 0s
no-shared (macos-latest)	10m 59s
out-of-source-and-install (macos-latest)	17m 46s
threads_sanitizer	9m 2s
	5h 11m 42s

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