feat(web-app): added CI to build docker image CD to deploy the app

Signed-off-by: Klagarge <remi@heredero.ch>

web-app/.gitlab-ci.yml

@@ -0,0 +1,22 @@
+variables:
+  DOCKER_IMAGE: registry.forge.hefr.ch/team-raclette/project-softweng/web-app:latest
+
+default:
+  image: $DOCKER_IMAGE
+
+stages:
+  - build-docker
+
+docker-build:
+  image: docker:latest
+  stage: build-docker
+  services:
+    - docker:dind
+  script:
+    - docker build -t $DOCKER_IMAGE -f web-app/Dockerfile .
+    - echo $CI_REGISTRY_PASSWORD | docker login -u $CI_REGISTRY_USER --password-stdin $CI_REGISTRY
+    - docker push $DOCKER_IMAGE
+  rules:
+    - if: $CI_PIPELINE_SOURCE == 'merge_request_event' && $CI_COMMIT_BRANCH == 'main'
+    - changes:
+        - web-app/*