Use a matrix for nightly valgrind (Take 6) #72

Job	Run time
PQ/T TLS 1.3	57s
Sanitizers (sanitizer, msvc, windows-2022, ninja)	4m 40s
TLS-Anvil (server)	4m 55s
clang-tidy	4m 55s
Sanitizers (sanitizer, gcc, ubuntu-24.04)	4m 55s
valgrind (clang, -O1, valgrind-ct-full)	4m 46s
valgrind (clang, -O2, valgrind-ct-full)	4m 45s
Cross (cross-alpha, gcc, ubuntu-24.04)	4m 34s
valgrind (clang, -O3, valgrind-ct-full)	4m 33s
Cross (cross-hppa64, gcc, ubuntu-24.04)	4m 30s
valgrind (gcc, -O1, valgrind-ct-full)	4m 33s
valgrind (gcc, -O2, valgrind-ct-full)	4m 32s
Cross (cross-m68k, gcc, ubuntu-24.04)	3m 49s
Cross (cross-mips, gcc, ubuntu-24.04)	3m 9s
valgrind (gcc, -O3, valgrind-ct-full)	4m 31s
Cross (cross-ppc32, gcc, ubuntu-24.04)	32s
valgrind (clang, -O3, valgrind-full)	4m 33s
Cross (cross-sh4, gcc, ubuntu-24.04)	1s
Cross (cross-sparc64, gcc, ubuntu-24.04)	1s
Cross (cross-riscv64, gcc, ubuntu-24.04)	3m 10s
valgrind (clang, -Os, valgrind-ct-full)	4m 33s
Cross (cross-s390x, gcc, ubuntu-24.04)	1s
valgrind (gcc, -Os, valgrind-ct)	4m 32s
Cross (cross-android-arm64-amalgamation, clang, ubuntu-24.04)	48s
Cross (cross-arm64-amalgamation, gcc, ubuntu-24.04)	4m 29s
Cross (emscripten, emcc, macos-14)	4m 36s
Cross (sde, gcc, ubuntu-24.04)	1s
	1h 31m 21s

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