Update Dockerfile

Dockerfile

@@ -1,8 +1,10 @@
 FROM postgres:latest
 
-RUN chown -R postgres /var
-ENV POSTGRES_PASSWORD=kogakisaki
+VOLUME /var/lib/postgresql/data
+
+ENV POSTGRES_PASSWORD=kogakisaki \
+    PGDATA=/var/lib/postgresql/data
 
 EXPOSE 5432
 
-CMD ["postgres", "-D", "/var/lib/postgresql/data"]
+CMD ["postgres"]