Use custom conda environment in Jupyter Notebook when user wants to use it

[mathbunnyru]

Describe your changes

Based on: #2049
All the credit goes to @benz0li

Issue ticket if applicable

Checklist (especially for first-time contributors)

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests
• I will try not to use force-push to make the review process easier for reviewers
• I have updated the documentation for significant changes

[mathbunnyru]

I checked the image and /home/${NB_USER}/.local/share/jupyter/kernels/python310/kernel.json looks nice.

@benz0li please review 🙂

[mathbunnyru]

As I said in the PR title all the credit goes to you.
I think it's a really nice change and our custom environment recipe is now really close to perfect 🙂
Thank you!

If we will need to add more env variables, it will be easier with Python implementation and the code is much more readable in general.

[benz0li]

ℹ️ The default kernel has indent=1:

cat /opt/conda/share/jupyter/kernels/python3/kernel.json

{
 "argv": [
  "/opt/conda/bin/python",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3 (ipykernel)",
 "language": "python",
 "metadata": {
  "debugger": true
 }
}

[benz0li]

@mathbunnyru See my comments. Thank you.

[mathbunnyru]

ℹ️ The default kernel has indent=1:

cat /opt/conda/share/jupyter/kernels/python3/kernel.json

{
"argv": [
 "/opt/conda/bin/python",
 "-m",
 "ipykernel_launcher",
 "-f",
 "{connection_file}"
],
"display_name": "Python 3 (ipykernel)",
"language": "python",
"metadata": {
 "debugger": true
}
}

Thank you. Fixed indent.

[mathbunnyru]

The build failure comes from the issue(s) mentioned in mamba-org/mamba#3036.

The recipe is expected to fail before images are updated.