Update .gitlab-ci.yml file

.gitlab-ci.yml

-#Workflow name
-name: CI/CD Pipeline
-on:
-  #Manually trigger workflow runs
-  workflow_dispatch:
-  #Trigger the workflow on push from the main branch
-  push:
-    branches:
-      - main
-jobs:
-  #Test's job
-  tests:
-    name: Unit tests
-    #Run on Ubuntu using the latest version
-    runs-on: ubuntu-latest
-    #Job's steps
-    steps:
-      #Check-out your repository under $GITHUB_WORKSPACE, so your workflow can access it
-      - uses: actions/checkout@v1
-      #Set up JDK 11
-      - name: Set up JDK
-        uses: actions/setup-java@v1
-        with:
-          java-version: '20'
-      #Set up Maven cache
-      - name: Cache Maven packages
-        #This action allows caching dependencies and build outputs to improve workflow execution time.
-        uses: actions/cache@v1
-        with:
-          path: ~/.m2
-          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
-          restore-keys: ${{ runner.os }}-m2
-      #Run Tests
-      - name: Run Tests
-        run: mvn -B test
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+image: maven:3.9.0-eclipse-temurin-19-focal
+
+variables:
+  SPRING_PROFILES_ACTIVE: gitlab-ci
+
+stages:
+  - build
+  - test
+  - deploy
+
+maven-build:
+  stage: build
+  script:
+    - mvn -v
+    - mvn package
+
+
+run-tests:
+  stage: test
+  script:
+  - mvn install
+  - mvn test
+
+deploy-jar:
+    stage: deploy
+    script:
+    - mvn install
+    artifacts:
+        paths:
+        - target/*.jar
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