Don't build docker image in docker-compose and use proper tag

Since we are building the image in gitlab ci, we should not attempt to
build it in docker-compose. We should also match the build tag to the
docker-compose file.

.gitlab-ci.yml

@@ -242,7 +242,7 @@ test_server_unit:
 test_server_functional:
   stage: test_functional
   script:
-    - docker build --build-arg git_branch=$CI_COMMIT_REF_NAME --build-arg build_env=TEST -t $CI_BUILD_REF_SLUG docker/vidjil
+      - docker build --build-arg git_branch=$CI_COMMIT_REF_NAME --build-arg build_env=TEST -t vidjil:test docker/vidjil
     - cd docker && (docker-compose up &) && cd ..
     - HEADLESS=1 make functional_server || (cd docker && docker-compose stop; false)
     - cd docker && docker-compose stop

docker/docker-compose.yml

@@ -8,7 +8,6 @@ services:
             - ./mysql/:/docker-entrypoint-initdb.d/
             - /opt/vidjil/mysql:/var/lib/mysql
     uwsgi:
-        build: ./vidjil
         image: vidjil:test
         command: bash /entrypoints/uwsgi-entrypoint.sh
         volumes_from: