Switched ci/cd to the new solution format

Author: ajgorhoe

.github/workflows/build.yml

@@ -147,15 +147,15 @@ jobs:
       - name: Restore NuGet packages
         shell: pwsh
         run: |
-          Write-Host "Restoring NuGet packages for ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.sln ... `n"
-          dotnet restore ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.sln
+          Write-Host "Restoring NuGet packages for ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.slnx ... `n"
+          dotnet restore ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.slnx
 
       # BUILD Main Project & Test Project in Release Mode
       - name: Build Solution
         shell: pwsh
         run: |
-          Write-Host "Building solution: ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.sln ... `n"
-          dotnet build ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.sln --configuration Release --no-restore
+          Write-Host "Building solution: ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.slnx ... `n"
+          dotnet build ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.slnx --configuration Release --no-restore
 
       # RUN TESTS & COLLECT RESULTS
       - name: Run Tests
@@ -165,8 +165,8 @@ jobs:
         shell: pwsh
         continue-on-error: true # ToDo: set to false later!
         run: |
-          Write-Host "Running tests for ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.sln ... `n"
-          dotnet test ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.sln --configuration Release --logger trx --results-directory TestResults
+          Write-Host "Running tests for ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.slnx ... `n"
+          dotnet test ${{ env.REPO_DIR }}/${{ env.REPO_DIR }}.slnx --configuration Release --logger trx --results-directory TestResults
         # ${{ env.IGNORE_TEST_ERRORS }}
 
       - name: Upload test results