feat: add testing setup in backend

docker-compose.testing.yml

@@ -1,14 +1,17 @@
 version: '3'
 services:
   cypress:
-    image: cypress/included
+    build:
+      context: .
+      dockerfile: tests/Dockerfile
     networks:
       - internal
     volumes:
-      - ./tests:/e2e
-    working_dir: /e2e
+      - ./tests:/e2e/tests
     environment:
       - BASE_URL=http://app-test
+      - TESTING_USERNAME=alex
+      - TESTING_PASSWORD=Alex1234
     depends_on:
       - app-test
 
@@ -49,6 +52,9 @@ services:
       - GITHUB_CLIENT_SECRET=${GITHUB_CLIENT_SECRET}
       - SURVEY_URL=${SURVEY_URL}
       - BUG_REPORT_URL=${BUG_REPORT_URL}
+      - TESTING=true
+      - TESTING_USERNAME=alex
+      - TESTING_PASSWORD=Alex1234
 
   db-test:
     image: mongo