reinitialize display for tests

Author: madhephaestus

.github/workflows/release.yml

@@ -50,6 +50,12 @@ jobs:
         java-version: 21
         jdkFile: zulu21.46.19-ca-fx-jdk21.0.9-linux_x64.tar.gz
 
+	- name: start xvfb
+	  run:
+	    Xvfb :99 &
+	- name: initialize the X11 DISPLAY variable
+	  run:
+	    export DISPLAY=:99  		
     - name: Run Unit Tests
       run: xvfb-run -s '-screen 0 1024x768x24' ./gradlew test     
     - name: release