Can't get Gitpod setup to work

[fapdash]

Describe the bug
I'm following your tutorial here: https://medium.com/@McGivrer/gitpod-save-your-life-de937bf2bd71

To Reproduce
Steps to reproduce the behavior:

1. Go to https://gitpod.io/new#https://github.com/mcgivrer/minimal/
2. Create workspace
3. Open src/main/java/fr/snapgames/game/core/Game.java
4. Run and debug (F5)

Expected behavior
Game becomes available on port 3000.

Actual

Output:

/usr/bin/env /home/gitpod/.sdkman/candidates/java/19.0.2-zulu/bin/java -agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:41177 @/tmp/cp_24ogv7q67cnawia7mr0bs395o.argfile fr.snapgames.game.core.Game 
Picked up JAVA_TOOL_OPTIONS: -XX:+UseContainerSupport -XX:ActiveProcessorCount=1
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.debug.level to 1
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.window.strategy to 2
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.acceleration.y.max to 4.0
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.window.scale to 1.0
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.render.fps to 60
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.scene.list to demo:fr.snapgames.game.demo101.scenes.DemoScene,title:fr.snapgames.game.demo101.scenes.TitleScene
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.speed.x.max to 6.0
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.acceleration.min to 0.001
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.window.size to 640x400
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.viewport.size to 320x200
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.speed.min to 0.001
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.gravity to v(0.0,-0.981)
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.scene.default to title
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.acceleration.x.max to 4.0
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.speed.y.max to 6.0
Sep 10, 2024 10:44:53 AM fr.snapgames.game.core.configuration.Configuration parseConfigFile
INFO: file=/game.properties : set game.physic.world.playarea.size to 1008x642
INFO: File has been parsed.
Exception in thread "main" java.awt.HeadlessException: 
No X11 DISPLAY variable was set,
or no headful library support was found,
but this program performed an operation which requires it,

        at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:166)
        at java.desktop/java.awt.Window.<init>(Window.java:553)
        at java.desktop/java.awt.Frame.<init>(Frame.java:428)
        at java.desktop/javax.swing.JFrame.<init>(JFrame.java:224)
        at fr.snapgames.game.core.graphics.Window.<init>(Window.java:30)
        at fr.snapgames.game.core.Game.initialize(Game.java:111)
        at fr.snapgames.game.core.Game.run(Game.java:248)
        at fr.snapgames.game.core.Game.main(Game.java:297)

Additional Context

Port 3000 is shown as not served in the ports tab.

Isn't this supposed to work? Am I doing something wrong?