Prevent Docker container to exit

Question

I'm start to dockerize a Linux Application and to do that I wrote a Dockerfile that:

• Extract the application TAR file into a directory.
• Execute the "entrypoint.sh"

the "entrypoint.sh":

• Check if the application is already installed.
• If the application is not installed, execute the installation script.

After that the container stops because the application run a background service.

Since I'm relative new to dockerize application, how can I prevent the container to stop?

Thanks for the help!