Update .gitlab-ci.yml

.gitlab-ci.yml

-image: maven:3.6.3-jdk-8
+image: debian:latest
 
 
 build:
     script:
+        - wget https://download.bell-sw.com/java/8u252+9/bellsoft-jdk8u252+9-linux-amd64-full.deb
+        - ./bellsoft-jdk8u252+9-linux-amd64-full.deb
         - apt-get update
-        - apt-cache madison openjfx
-        - apt-get install openjfx=8u111-b14-1 libopenjfx-java=8u111-b14-1 libopenjfx-jni=8u111-b14-1
+        - apt-get install -y maven
         - mvn package -B
         
 release: