https://ccache.dev/manual/3.7.11.html#_configuration uses CCACHE_DIR to set
cache directory. CCACHE_PATH has a different meaning.
+ removed LLVM_CCACHE_DIR ccache argument to use CCACHE_DIR from env.
+ print additional info about ccache config and machine readable stats.
maybe we will later use same agents for everything but for now I don't
want to modify working build much. But I have updated deployment of
release agent to use correct docker image (there were renamed a while
ago) and pass tags and agent token via env variables.
Have not deployed new deployment for release yet.
