Github action :- Unrecognized named-value: 'GITHUB_REPOSITORY'

 

While trying to use github action, I tried to use environment variable like this. And get Unrecognized named-value: 'GITHUB_REPOSITORY' issues.

  - name: build dotnet

        run: |

            cd ${{ GITHUB_WORKSPACE }}

            cd src/ConsoleApp1

            dotnet restore

            dotnet build

Then i change to the $GITHUB_WORKSPACE, i was able to get it working. 

  - name: build dotnet

        run: |

            cd $GITHUB_WORKSPACE

            cd src/ConsoleApp1

            dotnet restore

            dotnet build

So what is the differences between these? 

$GITHUB_WORKSPACE are used within shell scripts.