📎 Add postgres-upgrade.sh script

docker/postgres-upgrade.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+set -x
+
+export OLDVER=${1:-13}
+export NEWVER=$(pg_ctl --version | sed -nE 's/^.+ .+ ([0-9]+).*$/\1/p');
+
+export PGBINOLD=/usr/lib/postgresql/${OLDVER}/bin
+export PGBINNEW=/usr/lib/postgresql/${NEWVER}/bin
+export PGDATAOLD=/var/lib/postgresql/${OLDVER}/data
+export PGDATANEW=/var/lib/postgresql/${NEWVER}/data
+
+sed -i "s/$/ ${OLDVER}/" /etc/apt/sources.list.d/pgdg.list
+
+apt-get update \
+  && apt-get install -y --no-install-recommends postgresql-${OLDVER} \
+  && rm -rf /var/lib/apt/lists/*
+
+mkdir -p "$PGDATAOLD" "$PGDATANEW" \
+  && chown -R postgres:postgres /var/lib/postgresql
+
+pushd /var/lib/postgresql
+
+PGDATA=$PGDATANEW gosu postgres initdb -U penpot --data-checksums
+gosu postgres pg_upgrade -U penpot
+
+popd