Update Dockerfile.ubuntu

Author: binaryoverload

Dockerfile.ubuntu

@@ -1,7 +1,7 @@
-ARG POSTGRES_VERSION=15
-
 FROM ubuntu:latest AS base
 
+ARG POSTGRES_VERSION=15
+
 RUN apt-get -y update && apt-get -y install lsb-release ca-certificates wget gnupg && \
     echo "deb https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \
     wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - && \