How to run a project in Jenkins?

Question

bash

There is a project uploaded to GitLab, jenkins is connected to the project.
How to configure jenkins to run tests?
Bottom line: I have an application written in JavaFX, it is launched using a bash script that collects the jar files needed by the application and launches it.
I also want to say there is no maven in the project. What it is and what it is eaten with - I do not know.
This script has been moved to intelleji.
The application is launched, the buttons in it are poked, everything is as it should be, the tests are being executed.
I will say in advance that the test environment is written in marathon (a sort of driver for selenium, which allows it to control an FX application).
I need to set up Jenkins to run the application and tests on a VM with no IDEA.
Help, I'm completely new to this, I've been working as a tester for the 5th month without training :C

Answer 1

Okay, scripts run with gradle, no jenkins script yet