Revert "joink postgres16 from another image while we wait for the off…

…icial packages in amazonlinux:2023"

This reverts commit 470933e.

backup/Dockerfile

@@ -1,15 +1,6 @@
-# amazonlinux does not provide packages for postgresql16 as of now
-# https://github.com/amazonlinux/amazon-linux-2023/issues/516
-FROM public.ecr.aws/docker/library/postgres:16 as pg-client
 FROM amazonlinux:2023
 
-RUN dnf update -y \
-  && dnf install -y libpq awscli jq \
-  && dnf clean all
-
-COPY --from=pg-client /usr/lib/postgresql/16 /usr/lib/postgresql/16
-ENV LD_LIBRARY_PATH="/usr/lib/postgresql/16/lib:${LD_LIBRARY_PATH}"
-ENV PATH="/usr/lib/postgresql/16/bin:${PATH}"
+RUN yum update && yum install -y postgresql16 awscli jq
 
 COPY backup.sh /backup.sh