ci: Attempting to add SLSA action #461

Job	Run time
Windows MSVC x64	1m 33s
Windows MSVC x86	1m 12s
Windows GCC	1m 56s
Windows Clang	1m 56s
Ubuntu GCC	37s
Ubuntu Clang	32s
MUSL Cross Compile x86_64	1m 20s
MUSL Cross Compile i686	46s
MUSL Cross Compile aarch64	1m 7s
MUSL Cross Compile armv7l	46s
MUSL Cross Compile armv6	50s
MUSL Cross Compile armv5l	45s
MUSL Cross Compile powerpc64	55s
MUSL Cross Compile powerpc64le	57s
provenance / detect-env	5s
provenance / generator	9s
provenance / upload-assets	0s
provenance / final	1s
	15m 27s

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