Remove default_channels

By default, we have:
default_channels:
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r

Set it to an empty list to make sure repo.anaconda.com
is not accessed (there shouldn't be any connection to it from the TN).

JIRA INFRA-1560 #action In Progress

molecule/default/tests/test_conda.py

@@ -23,6 +23,7 @@ def test_condarc_file(host):
 channels:
   - conda-forge
   - anaconda-main
+default_channels: []
 auto_update_conda: False
 use_only_tar_bz2: True"""
     else:
@@ -32,6 +33,7 @@ channels:
   - ics-conda
   - conda-forge
   - anaconda-main
+default_channels: []
 auto_update_conda: False
 use_only_tar_bz2: True"""
 

templates/system_condarc.j2

@@ -3,5 +3,6 @@ channels:
 {% for channel in conda_channels %}
   - {{ channel }}
 {% endfor %}
+default_channels: []
 auto_update_conda: False
 use_only_tar_bz2: True