Use a matrix for nightly valgrind (Take 7) #73

Job	Run time
valgrind (clang, -O1, valgrind-ct-full)	7m 5s
valgrind (clang, -O2, valgrind-ct-full)	7m 6s
Sanitizers (sanitizer, msvc, windows-2022, ninja)	6m 51s
valgrind (clang, -O3, valgrind-ct-full)	7m 6s
PQ/T TLS 1.3	50s
Sanitizers (sanitizer, gcc, ubuntu-24.04)	7m 7s
valgrind (gcc, -O1, valgrind-ct-full)	7m 5s
clang-tidy	7m 6s
valgrind (gcc, -O2, valgrind-ct-full)	7m 6s
TLS-Anvil (server)	7m 5s
Cross (cross-alpha, gcc, ubuntu-24.04)	6m 19s
valgrind (gcc, -O3, valgrind-ct-full)	7m 5s
Cross (cross-hppa64, gcc, ubuntu-24.04)	7m 6s
Cross (cross-m68k, gcc, ubuntu-24.04)	7m 3s
valgrind (clang, -O3, valgrind-full)	7m 6s
Cross (cross-mips, gcc, ubuntu-24.04)	7m 7s
valgrind (clang, -Os, valgrind-ct-full)	7m 5s
Cross (cross-ppc32, gcc, ubuntu-24.04)	36s
valgrind (gcc, -Os, valgrind-ct)	7m 6s
Cross (cross-sh4, gcc, ubuntu-24.04)	1s
Cross (cross-sparc64, gcc, ubuntu-24.04)	1s
Cross (cross-riscv64, gcc, ubuntu-24.04)	5m 38s
Cross (cross-s390x, gcc, ubuntu-24.04)	31s
Cross (cross-android-arm64-amalgamation, clang, ubuntu-24.04)	38s
Cross (cross-arm64-amalgamation, gcc, ubuntu-24.04)	7m 4s
Cross (emscripten, emcc, macos-14)	6m 15s
Cross (sde, gcc, ubuntu-24.04)	1s
	2h 21m 9s

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