Allow to specify conda store service namespace via environment variable

[krassowski]

Reference Issues or PRs

This is one way to fix #6. I am not sure why namespace is not included in CONDA_STORE_SERVICE itself, but I guess changing that would breaking a lot of deployments.

What does this implement/fix?

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Documentation

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Any other comments?

[viniciusdc]

LGTM

[krassowski]

I will go ahead and merge. What is the procedure for release to unblock the nebari PR?