Get rid of conda from byzer-notebook image

[chncaesar]

Ray 1.8.0 is installed using Conda , and takes up to 2.1 GB of space. See the details

/tmp/a/opt$ du -h /tmp/a/opt/conda/envs --max-depth=1
2.1G    /tmp/a/opt/conda/envs/ray1.8.0
2.1G    /tmp/a/opt/conda/envs

I exported byzer-ntoebook:1.1.1 container to directory: /tmp/a

Size of the image is 4.04 GB.

byzer/byzer-notebook                                           1.1.1                  49e8881f6a94   13 days ago     4.04GB