refactor: move getMountPath function to services and update logic

- Moved the getMountPath function from the postgres router to the postgres service for better organization.
- Updated the logic to return the correct mount path based on the PostgreSQL version, ensuring compatibility with versions below 18.

packages/server/src/services/postgres.ts

@@ -13,6 +13,18 @@ import { TRPCError } from "@trpc/server";
 import { eq, getTableColumns } from "drizzle-orm";
 import { validUniqueServerAppName } from "./project";
 
+export function getMountPath(dockerImage: string): string {
+	const versionMatch = dockerImage.match(/postgres:(\d+)/);
+
+	if (versionMatch?.[1]) {
+		const version = Number.parseInt(versionMatch[1], 10);
+		if (version >= 18) {
+			return `/var/lib/postgresql/${version}/data`;
+		}
+	}
+	return "/var/lib/postgresql/data";
+}
+
 export type Postgres = typeof postgres.$inferSelect;
 
 export const createPostgres = async (input: typeof apiCreatePostgres._type) => {