Add OpenSSF badge to README #3940

Job	Run time
pre-commit / pre-commit	1m 7s
ubuntu / clang-build (ubuntu-24.04)	57s
mac / clang-build (Debug)	1m 40s
ubuntu / clang-build (ubuntu-24.04-arm)	58s
windows / clang-build	2m 24s
mac / clang-build (Release)	2m 12s
ubuntu / gcc-build (ubuntu-24.04, Debug)	1m 5s
ubuntu / gcc-build (ubuntu-24.04, Release)	53s
windows / msvc-build (Release)	2m 7s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 2s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	52s
windows / msvc-build (Debug)	2m 47s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	1m 9s
ubuntu / clang-test (ubuntu-24.04)	8m 21s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 25s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 28s
ubuntu / gcc-test (ubuntu-24.04)	8m 25s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 56s
windows / clang-test	4m 24s
windows / msvc-test	5m 8s
mac / clang-test	4m 48s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 29s
windows / clang-test-extended	3m 27s
windows / msvc-test-extended	3m 12s
mac / clang-test-extended	3m 10s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 26s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 29s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 38s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 30s
ubuntu / gcc-build-codecov	6m 22s
perf / ubuntu-gcc-build-perf-stats	1m 44s
perf / macos-clang-build-perf-stats	2m 47s
pages / build-scoreboard	17s
pages / build-doxygen-xml	1m 28s
pages / build-sphinx	2m 20s
pages / deploy-pages	0s
	1h 55m 27s

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