e2e test use the K8SPG-708-ppg image for now

Author: gkech

Diff for: e2e-tests/vars.sh

@@ -14,7 +14,7 @@ export IMAGE_BASE=${IMAGE_BASE:-"perconalab/percona-postgresql-operator"}
 export IMAGE=${IMAGE:-"${IMAGE_BASE}:${VERSION}"}
 export PG_VER="${PG_VER:-16}"
 export IMAGE_PGBOUNCER=${IMAGE_PGBOUNCER:-"${IMAGE_BASE}:main-ppg$PG_VER-pgbouncer"}
-export IMAGE_POSTGRESQL=${IMAGE_POSTGRESQL:-"${IMAGE_BASE}:main-ppg$PG_VER-postgres"}
+export IMAGE_POSTGRESQL=${IMAGE_POSTGRESQL:-"${IMAGE_BASE}:K8SPG-708-ppg$PG_VER-postgres"}
 export IMAGE_BACKREST=${IMAGE_BACKREST:-"${IMAGE_BASE}:main-ppg$PG_VER-pgbackrest"}
 export IMAGE_UPGRADE=${IMAGE_UPGRADE:-"${IMAGE_BASE}:main-upgrade"}
 export BUCKET=${BUCKET:-"pg-operator-testing"}