Update Dockerfile

server/Dockerfile

@@ -1,7 +1,8 @@
 FROM node
 RUN apt-get update
 WORKDIR /app
+RUN apt-get install sendmail
 RUN npm install -g pnpm
 COPY . /app
 RUN pnpm i
-CMD [ "pnpm", "start" ]
+CMD service sendmail start && pnpm start