feat: Install percona-pg-stat-monitor

Author: cbaker6

Dockerfile

@@ -22,6 +22,7 @@ RUN apt-get update \
       postgresql-$PG_MAJOR-repack \
       postgresql-$PG_MAJOR-cron \
       postgresql-$PG_MAJOR-pgrouting \
+      percona-pg-stat-monitor$PG_MAJOR \
  && rm -rf /var/lib/apt/lists/* \
  && mkdir -p /docker-entrypoint-initdb.d