Add .gitlab-ci.yml

.gitlab-ci.yml

+name: Maven CI/CD
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build_and_test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 17
+        uses: actions/setup-java@v1
+        with:
+          java-version: 17
+
+
+
+
+      - name: Build project with Maven
+        run: mvn -B package --file pom.xml
+
+
+      - name: Deploy to Heroku. # Your custom step name
+        uses: gonuit/heroku-docker-deploy@v1.3.3 # GitHub action name (leave it as it is).
+        with:
+          # Below you must provide variables for your Heroku app.
+
+          # The email address associated with your Heroku account.
+          # If you don't want to use repository secrets (which is recommended) you can do:
+          # email: my.email@example.com
+          email: ${{ secrets.HEROKU_EMAIL }}
+
+          # Heroku API key associated with provided user's email.
+          # Api Key is available under your Heroku account settings.
+          heroku_api_key: ${{ secrets.HEROKU_API_KEY }}
+
+          # Name of the heroku application to which the build is to be sent.
+          heroku_app_name: ${{ secrets.HEROKU_APP_NAME }}