Update Dockerfile

Author: Elodie0530

backend/Dockerfile

@@ -12,8 +12,8 @@ ENV DB_PASSWORD=${DB_PASSWORD}
 ARG DB_NAME=${DB_NAME}
 ENV DB_NAME=${DB_NAME}
 
-COPY ./backend .
+COPY . .
 
 RUN npm install
 
-CMD [ "npm", "start" ]
+CMD [ "npm", "start" ]