feat: add a way of using GHA cache locally

This is the first implementation of uploading the local cache
as a single file to a remote cache for reuse in a future build.

Right now it is only done for GHA as that was the intended scope¹,
but one could adapt this system to other remote caches.

Because of the immutability of GHACache, this commit only adds support
for re-using the cache for the same version (as defined by the user
through the `SCCACHE_GHA_VERSION` environment variable).
A way of reusing incremental build within a given version or even
across versions could be devised, but it falls outside the scope of
this particular effort, and it's probably not trivial.

[1] Mozilla-Actions/sccache-action#81