FIX: install pgvector package for old PG versions during update (#932)

Author: mwaniki-wairungu

templates/postgres.15.template.yml

@@ -110,7 +110,7 @@ run:
          rm -fr /shared/postgres_data_new
          install -d -m 0755 -o postgres -g postgres /shared/postgres_data_new && sudo -u postgres /usr/lib/postgresql/15/bin/initdb -D /shared/postgres_data_new || exit 0
          apt-get update
-         apt-get install -y postgresql-${PG_MAJOR_OLD}
+         apt-get install -y postgresql-${PG_MAJOR_OLD} postgresql-${PG_MAJOR_OLD}-pgvector
          chown -R postgres:postgres /var/lib/postgresql/15
          /etc/init.d/postgresql stop
          rm -fr /shared/postgres_data/postmaster.pid

templates/postgres.template.yml

@@ -110,7 +110,7 @@ run:
          rm -fr /shared/postgres_data_new
          install -d -m 0755 -o postgres -g postgres /shared/postgres_data_new && sudo -u postgres /usr/lib/postgresql/15/bin/initdb -D /shared/postgres_data_new || exit 0
          apt-get update
-         apt-get install -y postgresql-${PG_MAJOR_OLD}
+         apt-get install -y postgresql-${PG_MAJOR_OLD} postgresql-${PG_MAJOR_OLD}-pgvector
          chown -R postgres:postgres /var/lib/postgresql/15
          /etc/init.d/postgresql stop
          rm -fr /shared/postgres_data/postmaster.pid