Delete .gitlab-ci.yml

.gitlab-ci.yml

-image: gradle:jdk17
-
-before_script:
-  - export GRADLE_USER_HOME=`pwd`/.gradle
-
-cache:
-  paths:
-    - .gradle/wrapper
-    - .gradle/caches
-
-java:
-  stage: test
-  script:
-    - gradle test
-  artifacts:
-    when: always
-    reports:
-      junit: build/test-results/test/**/TEST-*.xml
\ No newline at end of file