[miniforge] no fail on existing installation #167
Merged
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Fixes #166
Note that this does not handle the case where the existing version is not the version requested. I started to address it, but it is made more complicated by the fact that mambaforge versions don't seem to keep up with official conda releases, so I didn't venture further down that path (i.e. if someone comes with an image with a fresh conda install, we would almost certainly be down-grading it here, which might not be desired).
I also updated the devcontainer spec of this repo because it was using an outdated
docker-from-docker
feature, which in turn made the tests in the tests break when running in the devcontainer.