Add support for build cache

[magnesj]

Hi,

I am looking into how to use a build cache to reduce build times. Is this something you might consider to include in your GitHub Action?

One alternative that looks promising https://github.com/mbitsnbites/buildcache

Regards Magne

[lukka]

I took a brief look to the buildcache tool, look interesting. Regarding run-cmake, I think you can use it in one of these ways:

1. instruct CMake to run buildcache in place of the compiler;
2. create a toolchain for using buildcache in CMake;
3. use the cmakeWrapperCommand input, it allows you to run CMake onto the environment set up by a wrapper for buildcache.

Is there anything in particular feature that you have in mind that may be good to have?

[magnesj]

Thanks for you comments.

I think it could be useful to have the buildcache as an optional part of run-cmake, and I think your option number 1 is the best and maybe easiest to implement and use.

[lukka]

@magnesj if feel like the usage of option number 1 is indeed the most widely used and accepted solution. Avoiding adding another input argument to 'run-cmake' action is also always the best option :)