Add Conda packages for pvapy and epics-base

Epics-base is pinned to a specific build to use the package
built by ESS.
epics-base=7.0.3.1=h68659b9_4

defaults/main.yml

@@ -18,8 +18,10 @@ phoebus_ess_symbols_path: "{{ phoebus_git_folders_base }}/ess-symbols"
 phoebus_ess_templates_path: "{{ phoebus_git_folders_base }}/ess-templates"
 # Set to [] to not create a python environment
 phoebus_python_packages:
+  - epics-base=7.0.3.1=h68659b9_4
   - python=3.7
   - py4j
+  - pvapy
   - connect2j
   - numpy=1.17
   - scipy=1.3

vars/main.yml

 ---
 phoebus_home: "{{ phoebus_installation_dir }}/ess-cs-studio-phoebus-{{ phoebus_version }}"
 phoebus_icon: "{{ phoebus_home }}/css-512x512.png"
+conda_channels:
+  - conda-e3-virtual
+  - ics-conda-forge
+  - conda-forge
+  - anaconda-main