Use Python 3.10 base image

[pamelafox]

Purpose

This PR updates the dev container to use a Python 3.10 base image, instead of the universal bullseye. It subsequently removes the Python feature, since it's slow. The feature was also using "os-provided" as the Python version, which is problematic on machines that have bad Python installs (like mine!). It's a more consistent environment to use the Docker's Python. (Related issue: #343)

A similar change was made in the Python azd templates a while back: https://github.com/Azure-Samples/todo-python-mongo-terraform/blob/main/.devcontainer/Dockerfile

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Open in Dev Container on Mac, run azd up
• Open in GitHub Codespaces, run azd up.

[tonybaloney]

This doesn't work for me:

[12350653 ms] Start: Run: docker inspect --type image mcr.microsoft.com/devcontainers/python:3.10
[12353447 ms] Error fetching image details: No manifest found for mcr.microsoft.com/devcontainers/python:3.10.
[12353447 ms] Start: Run: docker pull mcr.microsoft.com/devcontainers/python:3.10
Error response from daemon: Get "https://mcr.microsoft.com/v2/": net/http: TLS handshake timeout
[12374441 ms] []
[12374441 ms] Error: No such image: mcr.microsoft.com/devcontainers/python:3.10

[pamelafox]

@tonybaloney I wonder if that was an intermittent error? It's listed at that exact URL on: https://mcr.microsoft.com/en-us/product/devcontainers/python/about

I also just started a Codespace from this branch and it succeeded:

#9 [internal] load metadata for mcr.microsoft.com/devcontainers/python:3.10
2023-06-30 15:59:26.867Z: #9 DONE 0.8s
2023-06-30 15:59:27.112Z: 
#10 [context dev_containers_feature_content_source] load from client
#10 transferring dev_containers_feature_content_source: 72.97kB done
2023-06-30 15:59:27.230Z: #10 DONE 0.2s

I do sometimes have intermittent errors with the mcr.microsoft.com images, though not recently.

[chuwik]

This worked for me.