replace the custom miniconda installation with a role

[martenson]

custom role:

pulsar_node/roles/metacentrum.pulsar/tasks/main.yml

Line 63 in 6324811

- name: Check for Miniconda existence

ideally repladce with https://github.com/galaxyproject/ansible-miniconda

[martindemko]

We actually need this, because there was a trouble with official role. Root is installing the conda there and it's not possible to do on our pulsar instances connected to NFS via user's kerberos keytab

[martenson]

possibly related to galaxyproject/ansible-miniconda#4