E3-1576: Improve e3conda build
Closes E3-1576.
Tested pipelines:
- Pushing changes in non-main branch with dev variables: https://gitlab.esss.lu.se/douglasaraujo/testci-recipe/-/pipelines/191204
- Pushing changes in the main branch: https://gitlab.esss.lu.se/douglasaraujo/testci-recipe/-/pipelines/191200