Resolve "add maven cache config to gitlab CI"

Closes #1067 (closed)

.gitlab-ci.yml

@@ -5,10 +5,15 @@ stages:
   - packaging
   - test
 
+cache:
+  paths:
+    - maven.repository/
+
 variables:
   POSTGRES_DB: map_viewer
   POSTGRES_USER: map_viewer
   POSTGRES_PASSWORD: "123qweasdzxc"
+  MAVEN_OPTS: "-Dmaven.repo.local=maven.repository"
 
 test:frontend:
   stage: test