Support for conda explicit lockfiles

[epassaro]

Proposed change

Hi!

Conda currently supports exporting environments via conda list --explicit > spec-file.txt and installing them by doing conda create -n <env_name> --file spec-file.txt.

This kind of installation bypass the solver making builds really, really fast.

Alternative options

Also, using mamba instead of conda will speed up the deployment.

Who would use this feature?

Conda environment users that wants to build their environments faster.

(Optional): Suggest a solution

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[welcome[bot]]

Thank you for opening your first issue in this project! Engagement like this is essential for open source projects! :hugs:
If you haven't done so already, check out Jupyter's Code of Conduct. Also, please try to follow the issue template as it helps other other community members to contribute more effectively. You can meet the other Jovyans by joining our Discourse forum. There is also an intro thread there where you can stop by and say Hi! :wave:
Welcome to the Jupyter community! :tada:

[bollwyvl]

Looks like there is some more recent discussion of this here: https://github.com/jupyterhub/repo2docker/issues/1312