Using sscache for multiple jobs in a workflow

[DiamonDinoia]

Dear developers,

In my workflow we test a library over a many combinations of OS, compilers, flags. I would like to cache the results of these compilations. If I file is not modified between different branches or across multiple push, I would like to cache the particular results to speedup the compilations. So I tried integrating sscache in my workflow. However I get the following error:
fatal error C1041: cannot open program database 'D:\a\finufft\finufft\build\CMakeFiles\ducc0.dir\ducc0.pdb'; if multiple CL.EXE write to the same .PDB file, please use /FS
I have a few questions about sscache:

1. Can it cache results across multiple workflows?
2. Can it cache results across multiple branches of the same repository?
3. Can it cache results across multiple jobs in the same workflow?
4. Does it account for different compilers? Compiler flags and OSes?
5. In case of equality between compilers, os and flags, can they write to the same file?

Does the yml needs to be changed? If so how?

Thanks,
Marco