Is there a way to support multiline values?

[kiriakos]

Hi, thanks for creating this action, I have been using it quite successfully in the past months. Today I stumbled on an error when one of the secrets I was interpolating into the values contained newlines. Is there a way to work around this?

jobs:
  deploy:
    steps:
     - name: Set branch-based environment variables
        uses: iamtheyammer/[email protected]
        with:
          WORKING_SEC: |
            main:${{ secrets.PRODUCTION_SECRET }}
            develop:${{ secrets.DEVELOPMENT_SECRET }}
            staging:${{ secrets.STAGING_SECRET }}
          NEWLINE_SEC: |
            main:${{ secrets.PRODUCTION_SECRET_W_NEWLINE }}
            develop:${{ secrets.DEVELOPMENT_SECRET_W_NEWLINE }}
            staging:${{ secrets.STAGING_SECRET_W_NEWLINE }}

If the values to the secrets have newlines, eg: secrets.PRODUCTION_SECRET_W_NEWLINE contains

hello
world

the step will fail with the error message: Error: Invalid value for NEWLINE_SEC: *** does not contain a colon

[iamtheyammer]

This is a really interesting edge case. I'll have to fix #11 first, but I'll either make multiline values default or require something like

branch\:multi
line
value
anotherbranch:singlelinevalue
```.

[pravinprabhat]

Is there any update on the fix?