Set version dynamically based on GitHub run number

This commit adds a step to set the build version dynamically in the .github/workflows/dotnet.yml file. The new step uses the GitHub run number to update the version in the specified project file. This ensures that each build has a unique version based on the run number.

.github/workflows/dotnet.yml

@@ -24,7 +24,11 @@ jobs:
     - name: Install .NET Aspire workload
       run: dotnet workload install aspire
 
-
+    - name: Set version
+      run: |
+       echo "Buid version is ${{github.run_number}}"
+       sed -i "s/\(<Version>\([0-9]\+\.\)\{2\}\)\([0-9]\+\)/\1${{github.run_number}}/" ${{env.PROJECT_FILE}}       
+       
     - name: Restore dependencies
       run: dotnet restore
     - name: Build