How to properly invoke just commands in github actions with powershell?

[AlessandroMiola]

Hi! First off, thank you for this amazing tool!
I'm trying to adopt just and I fell into some issues while setting up a CI pipeline with Github Actions (tbh I'm pretty new to this, too, so I might be overlooking something); I'd like to reference some commands from my justfile in the Github Actions workflow, but I haven't found a way through yet. For personal preference, I'd like everything to work on powershell.

My justfile is as follows (should run on a Windows machine):

# Use PowerShell instead of sh, https://just.systems/man/en/chapter_3.html
set shell := ["powershell.exe", "-c"]

help:
  @just --list

install:
  @echo "🚀 Installing dependencies"
  @poetry install --with dev

install-pre-commit:
  @echo "🚀 Setting up the hooks"
  @poetry run pre-commit install

check-project:
  @echo "🚀 Checking consistency between poetry.lock and pyproject.toml"
  @poetry check --lock
  @echo "🚀 Running the hooks against all files"
  @poetry run pre-commit run --all-files

ruff:
  @echo "🚀 Linting the project with Ruff"
  @poetry run ruff check src tests

ruff-show-violations:
  @echo "🚀 Linting the project with Ruff and show violations"
  @poetry run ruff check --show-source --show-fixes src tests

ruff-fix:
  @echo "🚀 Linting the project with Ruff and autofix violations (where possible)"
  @poetry run ruff check --fix src tests

black:
  @echo "🚀 Formatting the code with Black"
  @poetry run black src tests

black-check:
  @echo "🚀 Checking formatting advices from Black"
  @poetry run black --check --diff src tests

lint-and-format: ruff black

test:
  @echo "🚀 Testing code with pytest"
  @poetry run pytest --verbose tests

test-and-report-cov:
  @echo "🚀 Testing code with pytest and generating coverage report"
  @poetry run pytest --cov=./ --cov-report=xml

and here is part of my .yaml file triggering the actions:

jobs:
  lint-and-test:
    runs-on: ubuntu-latest
    defaults:
      run:
        shell: pwsh

  steps:
    - name: Check out repository
      uses: actions/checkout@v4

    - name: Setup python
      uses: actions/setup-python@v4
      with:
        python-version: ${{ env.PYTHON_VERSION }}

    - name: Install Poetry
      uses: snok/install-poetry@v1
      with:
        virtualenvs-create: true
        virtualenvs-in-project: true
        installer-parallel: true

    - name: Load cached venv if cache exists
      id: cached-poetry-dependencies
      uses: actions/cache@v3
      with:
        path: .venv
        key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}

    - name: Install dependencies if cache does not exist
      if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
      run: poetry install --no-interaction --no-root

    - name: Install project
      run: poetry install --no-interaction

    - name: Setup just
      uses: taiki-e/install-action@just

    - name: Enforce code style (Ruff)
      run: just ruff-show-violations

    - name: Verify code formatting (Black)
      run: just black-check

    - name: Run tests
      run: just test

    - name: Generate test coverage report
      run: just test-and-report-cov

    - name: Upload coverage reports to Codecov
      uses: codecov/codecov-action@v3
      with:
        token: ${{ secrets.CODECOV_TOKEN }}
        verbose: true

All these set, I get the following error message:

> just ruff-show-violations
> shell: /usr/bin/pwsh -command ". '{0}'"
> env:
  > PYTHON_VERSION: 3.10
  > POETRY_VERSION: 1.6.1
    pythonLocation: /opt/hostedtoolcache/Python/3.10.13/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.10.13/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.10.13/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.10.13/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.10.13/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.10.13/x64/lib
    VENV: .venv/bin/activate
**error: Recipe `ruff-show-violations` could not be run because just could not find the shell: No such file or directory (os error 2)
Error: Process completed with exit code 1.**

In the idea of ensuring compatibility between set shell := ["powershell.exe", "-c"] in justfile and the setup of the default shell in actions.yaml (namely, trying to ensure alignment between the local execution environment and the Linux environment the Github Actions workflow runs on), I've tried to play around with these two with no luck. Neither setting pwsh nor powershell as default shell seems to work; specifying the shell at the level of single steps (with shell: option) doesn't work as well.

Can anyone help? Perhaps it should be better asked in https://github.com/taiki-e/install-action, but this repo is missing the Discussions tab.
Thank you in advance!

Update

I could get a working configuration while setting up everything to run on bash, but I'm yet to find a way to make it work on powershell. Plus, I noticed that - no matter what the default shell configuration in actions.yaml - taiki-e/install-action@just seems to always run on bash (and no with: shell: option to force a different behaviour is provided).