Merge branch 'feature/ci-cd' into 'main'

Added pipeline CI script, not sure if working

See merge request idatt2106-v23-03/backend!3

.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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