Issue with the "Run a FastAPI app" doc: `poetry shell` is no longer available

[noamraph]

I found an issue with this document.

Title: Run a FastAPI app
Location: https://fly.io/docs/python/frameworks/fastapi/
Source: https://github.com/superfly/docs/blob/main/python/frameworks/fastapi.html.markerb

Describe the issue

I install poetry using pipx install poetry. The page instructs to use poetry shell. However, when I run poetry shell, I get:

Looks like you're trying to use a Poetry command that is not available.

Since Poetry (2.0.0), the shell command is not installed by default. You can use,

  - the new env activate command (recommended); or
  - the shell plugin to install the shell command

Documentation: https://python-poetry.org/docs/managing-environments/#activating-the-environment

Note that the env activate command is not a direct replacement for shell command.

Addtional info

I followed https://github.com/python-poetry/poetry-plugin-shell to install the poetry shell plugin. But now, when running fly launch (In https://fly.io/docs/python/frameworks/fastapi/#deploy-a-fastapi-app-from-scratch), I get:

❯ fly launch
Scanning source code
INFO Detected Poetry project
Error: No dependencies found in pyproject.toml

Even though the pyproject.toml file contains the fastapi dependency:

❯ cat pyproject.toml
[project]
name = "fastapi-app"
version = "0.1.0"
description = ""
authors = [
    {name = "Noam Raphael",email = "noamraph@gmail.com"}
]
readme = "README.md"
requires-python = ">=3.10"
dependencies = [
    "fastapi[standard] (>=0.115.12,<0.116.0)"
]

[tool.poetry]
packages = [{include = "fastapi_app", from = "src"}]


[build-system]
requires = ["poetry-core>=2.0.0,<3.0.0"]
build-backend = "poetry.core.masonry.api"

[noamraph]

I now tried to install an older poetry version, with

pipx install poetry==1.8.4

But now deplyment failed with:

3.227 Installing /app/.venv/bin/fastapi over existing file
3.240
3.240 Installing the current project: fastapi-app (0.1.0)
3.241
3.241 Error: The current project could not be installed: Readme path `/app/README.md` does not exist.
3.241 If you do not want to install the current project use --no-root.
3.241 If you want to use Poetry only for dependency management but not for packaging, you can disable package mode by setting package-mode = false in your pyproject.toml file.
3.241 If you did intend to install the current project, you may need to set `packages` in your pyproject.toml file.
3.241
------
Error: failed to fetch an image or build from source: error building: failed to solve: process "/bin/sh -c poetry install" did not complete successfully: exit code: 1