Introduce PPC_IMPLEMENTATIONS variable (#593) #3820

Job	Run time
pre-commit / pre-commit	1m 24s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	57s
ubuntu / clang-build (ubuntu-24.04)	46s
windows / msvc-build (Release)	1m 59s
mac / clang-build (Release)	2m 12s
mac / clang-build (Debug)	2m 8s
ubuntu / gcc-build (ubuntu-24.04, Debug)	47s
ubuntu / clang-build (ubuntu-24.04-arm)	56s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 10s
windows / clang-build	1m 54s
windows / msvc-build (Debug)	2m 55s
ubuntu / gcc-build (ubuntu-24.04, Release)	52s
mac / clang-test	5m 6s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 15s
ubuntu / clang-test (ubuntu-24.04)	8m 24s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	51s
ubuntu / gcc-test (ubuntu-24.04)	8m 22s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 27s
windows / clang-test	2m 48s
windows / msvc-test	4m 53s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 53s
windows / clang-test-extended	2m 59s
mac / clang-test-extended	3m 6s
windows / msvc-test-extended	3m 1s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 34s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 50s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 29s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 29s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 29s
ubuntu / gcc-build-codecov	5m 53s
perf / macos-clang-build-perf-stats	1m 54s
perf / ubuntu-gcc-build-perf-stats	1m 42s
pages / build-scoreboard	13s
pages / build-doxygen-xml	1m 19s
pages / build-sphinx	1m 18s
pages / deploy-pages	0s
	1h 50m 15s

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