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