message: Refer to $GITHUB_WORKSPACE specifically in source-root description
  Previously, I had tried to refer to '${{ github.workspace }}', but that caused a problem in Actions. Trying to avoid the issue, I changed this to "the workspace," but this gives up quite a bit of specificity.
diff: @@ -39,7 +39,7 @@ inputs:
  required: true
  default: 'true'
  source-root:
  - description: Path to the root source-code directory, relative to the workspace.
  + description: Path of the root source code directory, relative to $GITHUB_WORKSPACE.
  required: false
  outputs:
  codeql-path:
  