Remove conda deployment tools and CI tasks

Frederik Hennigrequested to merge
fhennig/remove-conda-deploy into master

Remove the conda build scripts in utilities/conda and the conda deployment CI tasks.

Rationale

  • The conda deployment scripts were apparently written for Python versions (3.6 and 3.7) which are now far beyond their end-of-life
  • Knowledge about waLBerla's conda deployment has been lost over time, and no-one here has the time to relearn it
  • waLBerla has become too complex, its build modes and settings too varied to make any pre-built distribution sensible. As I see it, the only sensible way to distribute waLBerla these days is as source code.
Edited by Frederik Hennig

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