GitHub Actions pass list of variables to shell script

Using GitHub Actions, I would like to invoke a shell script with a list of directories. (Essentially equivalent to passing an Ansible vars list to the shell script)

I don't really know how, is this even possible? Here's what I have until now, how could one improve this?

name: CI

on:
  push:
    branches:
      - master

    tags:
      - v*

  pull_request:

jobs:
  run-script:
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v2

      - name: Run script on targets
        run: ./.github/workflows/script.sh {{ targets }}
        env:
          targets:
            - FolderA/SubfolderA/
            - FolderB/SubfolderB/

Solution

Today I was able to do this with the following YAML (truncated):

...
with:
  targets: |
    FolderA/SubfolderA
    FolderB/SubfolderB

The actual GitHub Action passes this as an argument like the following:

runs:
  using: docker
  image: Dockerfile
  args:
    - "${{ inputs.targets }}"

What this does is simply sends the parameters as a string with the newline characters embedded, which can then be iterated over similar to an array in a POSIX-compliant manner via the following shell code:

#!/bin/sh -l

targets="${1}"

for target in $targets
do
  echo "Proof that this code works: $target"
done

Which should be capable of accomplishing your desired task, if I understand the question correctly. You can always run something like sh ./script.sh $target in the loop if your use case requires it.