Fixed workspace reference

Author: dahall

.github/workflows/cibuild.yml

@@ -44,15 +44,15 @@ jobs:
       run: nuget locals all -clear
 
     - name: Restore Solution NuGet packages
-      working-directory: $env:GITHUB_WORKSPACE
+      working-directory: ${{env.GITHUB_WORKSPACE}}
       run: msbuild ${{env.SOLUTION_FILE_PATH}} /m /verbosity:quiet /t:restore /p:RunAnalyzersDuringBuild=false /p:Configuration=${{env.BUILD_CONFIGURATION}}
 
     - name: Build
-      working-directory: $env:GITHUB_WORKSPACE
+      working-directory: ${{env.GITHUB_WORKSPACE}}
       run: msbuild /m /verbosity:quiet /t:build /p:RunAnalyzersDuringBuild=false /p:Configuration=${{env.BUILD_CONFIGURATION}} ${{env.SOLUTION_FILE_PATH}}
 
     - name: Publish staging packages
-      working-directory: $env:GITHUB_WORKSPACE
+      working-directory: ${{env.GITHUB_WORKSPACE}}
       shell: pwsh
       run: Get-ChildItem ${{env.SOLUTION_PATH}} -Include "*.nupkg" -Recurse | ForEach-Object -Process { dotnet nuget push $_.FullName -k ${{env.STAGING_AUTH_TOKEN}} -s ${{env.STAGING_REPO}} }