Support caching of additional compiler output like diagnostics

[anotherandi]

Actual behavior

When I run gcc to emit Sarif output with the following command, a test.o file and an addtional test.cpp.sarif file will be written to disk.

ccache gcc -c ../test.cpp -fdiagnostics-format=sarif-file

When I delete the outputs and run the same command again ccache will only recreate the test.o, but the test.cpp.sarif is missing.

Expected behavior

I would be great if ccache could also cache the sarif output.
ccache already supports caching of dependency files, which is a quite similar functionality.
Maybe its best to have a generic/configurable functionality for this, since every compiler may has different "byproducts".

Environment

ccache version 4.9.1
gcc 13.2

References

https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-format