add build openssh from source

Resolved old SSH version (OpenSSH_8.9p1) in starterpack environments

The original openssh version we're using in starterpack environments is obsolete. This fix installs a newer (9.3) openssh from source.

After the k8s deployment is built:

ssh -V

returns OpenSSH_9.3p1, OpenSSL 3.0.2 15 Mar 2022

Note: Due to earlier timeouts of docker image builds on GitLab, this MR also removes the installation of custom packages with requirements.txt (we also omitted it in jakub branch built recently).

Note 2: The pipeline failed on deploy kubernetes step, it has nothing to do with correctness of this MR (check out terka deployment, which works on k8s as well).

After the fix is merged, we should propagate it to the feature branches and re-deploy the starterpack environments: lucie, david, katka, and jakub