Add OpenSSF badge to README (#615) #3941

Job	Run time
pre-commit / pre-commit	1m 11s
ubuntu / gcc-build (ubuntu-24.04, Release)	56s
ubuntu / clang-build (ubuntu-24.04-arm)	51s
ubuntu / gcc-build (ubuntu-24.04, Debug)	56s
ubuntu / clang-build (ubuntu-24.04)	50s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 9s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 2s
mac / clang-build (Release)	3m 22s
mac / clang-build (Debug)	2m 4s
windows / clang-build	2m 22s
windows / msvc-build (Debug)	2m 41s
windows / msvc-build (Release)	3m 14s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 33s
ubuntu / clang-test (ubuntu-24.04)	8m 19s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	1m 20s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 15s
ubuntu / gcc-test (ubuntu-24.04)	8m 24s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 57s
windows / clang-test	2m 52s
windows / msvc-test	4m 40s
mac / clang-test	5m 10s
windows / clang-test-extended	3m 11s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 22s
windows / msvc-test-extended	3m 12s
mac / clang-test-extended	2m 53s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 27s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 33s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 32s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 32s
ubuntu / gcc-build-codecov	5m 57s
perf / macos-clang-build-perf-stats	2m 11s
perf / ubuntu-gcc-build-perf-stats	1m 46s
pages / build-scoreboard	14s
pages / build-doxygen-xml	1m 5s
pages / build-sphinx	1m 41s
pages / deploy-pages	19s
	1h 54m 3s

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