feat(deploy): add vps deployment assets

deploy/vps/postgres/01-create-tenant-db.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+set -eu
+
+if [ -z "${TENANT_DATABASE_NAME:-}" ] || [ "${TENANT_DATABASE_NAME}" = "${POSTGRES_DB}" ]; then
+    exit 0
+fi
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname postgres <<-EOSQL
+    SELECT format('CREATE DATABASE %I', '${TENANT_DATABASE_NAME}')
+    WHERE NOT EXISTS (
+        SELECT 1
+        FROM pg_database
+        WHERE datname = '${TENANT_DATABASE_NAME}'
+    ) \gexec
+EOSQL