Create tarballs in CI deploy + cache; not zip

At the moment, CI creates and uses only ZIP files. These is an very unnative format for Linux and creates some problems:

symbolic links seem to be some extension which is not supported by all implementations. E.g. popular windows clients (7zip) create only some small text files which causes a lot of confusion.
hard links are not supported at all. Might be not a problem for deploy except that archive file is enlarged. But it can cause massive problems for caches when build system uses hard links.

There should be used a more native format for the deploy and cache archives, e.g. 'tar'