refactor/Updated .gitlab-ci.yml

.gitlab-ci.yml

 image: maven:3.8.5-openjdk-17
 
 variables:
-  # This will suppress any download for dependencies and plugins or upload messages which would clutter the console log.
-  MAVEN_OPTS: "-Dhttps.protocols=TLSv1.2 -Dmaven.repo.local=$CI_PROJECT_DIR/.m2/repository -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=WARN -Dorg.slf4j.simpleLogger.showDateTime=true -Djava.awt.headless=true"
-  MAVEN_CLI_OPTS: "--batch-mode --errors --fail-at-end --show-version -DinstallAtEnd=true -DdeployAtEnd=true"
   SPRING_PROFILES_ACTIVE: gitlab-ci 
   
-services:
-  - name: mysql:latest
-    alias: mysql
-    variables:
-      MYSQL_ROOT_PASSWORD: "root"  # TODO Set this in GitLab's CI/CD environment variables for security reasons
-      MYSQL_DATABASE: "sparesti"
+cache:
+  key: "${CI_COMMIT_REF_SLUG}" # Branch-specific cache keys to have separate caches across branches.
+  paths:
+    - .m2/repository
 
 stages:
-  - compile_and_test
+  - build_test
   - generate_site_reports
   - modify_generated_site_reports
-  - publish_pages
-
-cache:
-  key: "maven-repository" # Static Cache Key to keep cache across branches 
-  paths:
-    - .m2/repository
+  - pages
 
-compile_and_test:
-  stage: compile_and_test
+build_test_project:
+  stage: build_test
+  services:
+    - name: mysql:latest
+      alias: mysql
+      variables:
+        MYSQL_ROOT_PASSWORD: "root"  
+        MYSQL_DATABASE: "sparesti"
   script:
-    - mvn clean test # Cleans the previous build and runs tests
-  artifacts:
+    - mvn clean test
   when: always
+  artifacts:
+    expire_in: 1 day
     paths:
       - target/site/jacoco
     reports:
       junit:
         - target/surefire-reports/TEST-*.xml
         - target/failsafe-reports/TEST-*.xml
-  when: always
+  cache:
+    key: ${CI_COMMIT_REF_SLUG}
+    paths:
+      - .m2/repository
 
 generate_site_reports:
   stage: generate_site_reports
@@ -65,7 +65,7 @@ modify_generated_site_reports: # Modify the generated website containing project
 # We move the code coverage reports generated by jacoco and mvn site to be served by Gitlab Pages (Settings -> Pages)
 pages:
   image: alpine:latest
-  stage: publish_pages
+  stage: pages
   dependencies:
     - modify_generated_site_reports
   script: