added postgres repo

Dockerfile

@@ -14,10 +14,14 @@ RUN apt-get update -y \
   && echo \
   "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
   $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
-  tee /etc/apt/sources.list.d/docker.list > /dev/null
+  tee /etc/apt/sources.list.d/docker.list > /dev/null \
+  && apt-get update -y
 
-# Install Docker CLI + bash + core utilities
-RUN apt-get update -y \
+RUN install -d /usr/share/postgresql-common/pgdg \
+  && curl -o /usr/share/postgresql-common/pgdg/apt.postgresql.org.asc --fail https://www.postgresql.org/media/keys/ACCC4CF8.asc \
+  && . /etc/os-release \
+  && sh -c "echo 'deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc] https://apt.postgresql.org/pub/repos/apt $VERSION_CODENAME-pgdg main' > /etc/apt/sources.list.d/pgdg.list" \
+  && apt-get update -y \
   && apt-get install -y --no-install-recommends \
   cron \
   bash \
@@ -25,8 +29,8 @@ RUN apt-get update -y \
   curl \
   docker-ce-cli \
   postrgres17 \
-  && mkdir -p /backups \
-  && rm -rf /var/lib/apt/lists/*
+  && rm -rf /var/lib/apt/lists/* \
+  && mkdir -p /backups
 
 # Copy backup script
 COPY backup.sh /usr/local/bin/backup.sh