Default shell not being detected - currently treats all run on Linux as shell

[ElvenSpellmaker]

When using a default shell:

defaults:
  run:
    shell: pwsh

It's not being detected and actionlint is calling shellcheck on all runs without an explicit shell.

Ideally this would be taken into account and all run would use the default shell defined.

We use pwsh on Linux (as pwsh is cross-OS and a better scripting language than bash) so #315 isn't a solution of just branching workflows.

Relevant Issues: #315

[rhysd]

Would you share a minimal complete workflow which actionlint can cause the issue?

[rhysd]

I confirmed that this is a bug when actionlint fails to detect Windows runner from runs-on.

Reproduction:

on: push

defaults:
  run:
    shell: pwsh

jobs:
  test:
    strategy:
      matrix:
        os: [windows-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - run: |
          $Env:FOO = "FOO"

This doesn't reproduce when a Windows runner is directly set:

on: push

defaults:
  run:
    shell: pwsh

jobs:
  test:
    runs-on: windows-latest
    steps:
      - run: |
          $Env:FOO = "FOO"