flutter config --enable-linux-desktop doesn't apply before building

[mpconte]

With the sample workflow:

name: Build Flutter Demo for Linux

on:
  workflow_dispatch:  
  
jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2      
     
      - uses: subosito/flutter-action@v2
        with:
         channel: 'stable'

      - run: |
          sudo apt-get update -y
          sudo sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev 
      
      - name: Enable Linux desktop development 
        run: |          
          flutter config --enable-linux-desktop
                
      - name: Build linux application
        run: |
          flutter packages get
          flutter build linux

Returns the following error on flutter build linux:

[yurikoles]

The message states clearly: you need to set up and commit / push a Linux project before this action will make sense.