Update .gitlab-ci.yml

.gitlab-ci.yml

-image: bellsoft/liberica-openjdk-debian:8u
+image: slucky31/javafx
 
 
 build:
     script:
-        - apt-get update
-        - apt-get install -y --no-install-recommends maven
-        - apt-get install -y git
         - mvn package -B
         
 release: