Update .gitlab-ci.yml

.gitlab-ci.yml

-variables:
-  JAVA_HOME: "/usr/lib/jvm/java-1.8.0-openjdk-amd64"
+image: 3.6.3-jdk-8
 
 
 build:
     script:
+        - apt-get install openjfx
         - mvn package -B
         
 release:
     script:
+        - apt-get install openjfx
         - mvn package -B
         - FILE=$(ls target/ | grep '\.zip$' | head -n 1)
         - echo ${FILE}