Update dotnet command in Docker action script

Altered the dotnet command in the Docker action script to create a new class library in a project-specific directory. This change improves directory organization by ensuring each project's class library has its own separate folder.

docker-action/dotnet/create-classlib

@@ -4,4 +4,4 @@ WORKDIR /app
 
 ENV PROJECT_NAME=test
 
-CMD dotnet new classlib -n ${PROJECT_NAME} -o /data
+CMD dotnet new classlib -n ${PROJECT_NAME} -o /data/${PROJECT_NAME}