Add postgres dependency

Dockerfile

@@ -27,7 +27,8 @@ COPY . .
 # Uncomment the following line in case you want to disable telemetry during the build.
 # ENV NEXT_TELEMETRY_DISABLED 1
 
-RUN yarn build
+RUN --mount=type=secret,id=POSTGRES_URL,mode=0444,required=true \
+    yarn build
 
 # If using npm comment out above and use below instead
 # RUN npm run build
@@ -62,4 +63,4 @@ ENV PORT 3000
 # set hostname to localhost
 ENV HOSTNAME "0.0.0.0"
 
-CMD ["node", "server.js"]
+CMD ["node", "server.js"]