install: Use the apt postgres server packages from postgres.

This allows Debian and Ubuntu administrators to reasonably seamlessly
swap over to more recent version of postgres than ships with their
distribution.

scripts/lib/setup-apt-repo

@@ -37,14 +37,22 @@ SCRIPTS_PATH="$(dirname "$(dirname "$0")")"
 
 release=$(lsb_release -sc)
 if [[ "$release" =~ ^(xenial|bionic|cosmic|disco|eoan|focal)$ ]] ; then
+    apt-key add "$SCRIPTS_PATH"/setup/pgdg.asc
     apt-key add "$SCRIPTS_PATH"/setup/pgroonga-ppa.asc
     cat >$SOURCES_FILE <<EOF
+deb http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+deb-src http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+
 deb http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
 deb-src http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
 EOF
 elif [[ "$release" =~ ^(stretch|buster)$ ]] ; then
+    apt-key add "$SCRIPTS_PATH"/setup/pgdg.asc
     apt-key add "$SCRIPTS_PATH"/setup/pgroonga-debian.asc
     cat >$SOURCES_FILE <<EOF
+deb http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+deb-src http://apt.postgresql.org/pub/repos/apt/ $release-pgdg main
+
 deb https://packages.groonga.org/debian/ $release main
 deb-src https://packages.groonga.org/debian/ $release main
 EOF

scripts/setup/pgdg.asc

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