Support list input type

[bryanmacfarlane]

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Describe the enhancement
An action should be able to have an input type which is a list of strings. The toolkit should provide a getInput overload or new method to retrieve it.

Code Snippet

let vals: string[] = core.getListInput('inputName');

Additional information
Add any other context about the feature here.

[kiprasmel]

I was going through https://github.com/actions/cache trying to implement multiple path support, and when going through source code, I only noticed the core.getInput function, but not one for core.getInputs to get multiple of them.

Then, later, I found this:

const restoreKeys = core
	.getInput(Inputs.RestoreKeys)
	.split("\n")
	.filter(x => x !== "");

so, is

let vals: string[] = core.getInput('inputName').split("\n").filter(x => x !== "");

the official way of doing it?

If so, I've created a PR to implement this: #336

[AB-xdev]

Was this fixed with #829?

[asbjornu]

@AB-xdev, as far as I can tell, #829 implements support for values spanning multiple lines, not lists. With the implemented core.getMultilineInput() the following should be possible:

- uses: myaction
  with:
    multiline-param: |
      line1
      line2
      line3

However, the following is still not possible:

- uses: myaction
  with:
    list-param: ['item1', 'item2', 'item3']

Neither is this:

- uses: myaction
  with:
    list-param:
      - item1
      - item2
      - item3

[rickstaa]

@asbjornu Good extension! I created #1183 to also implement the second case. Not sure how to implement the last case since these parameters are passed as an environment parameter.

[git-developer]

I'm happy with this workaround posted on StackOverflow:

1. Definition: Use a property of type string and a literal with the JSON representation of the list, e.g. products: '["yellow", "green"]'
2. Use: Decode the string literal to a JSON list, e.g. ${{ fromJSON(inputs.products) }}

Example:

on:
  workflow_dispatch:
    inputs:
      products:
        description: "List of Products"
        default: '["yellow"]'
      limits:
        description: "List of limits"
        default: '[50]'

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        product: ${{ fromJSON(github.event.inputs.products) }}
        limits: ${{ fromJSON(github.event.inputs.limits) }}

[Edwardius]

can we have this pwease :3