Update postgresql snapshot tests

Author: cristianrgreco

packages/modules/postgresql/src/postgresql-container-snapshot.test.ts

@@ -1,10 +1,12 @@
 import { Client } from "pg";
 import { PostgreSqlContainer } from "./postgresql-container";
 
+const IMAGE = "postgres:13.3-alpine";
+
 describe("PostgreSqlContainer snapshot and restore", { timeout: 180_000 }, () => {
   // createAndRestoreFromSnapshot {
   it("should create and restore from snapshot", async () => {
-    const container = await new PostgreSqlContainer().start();
+    const container = await new PostgreSqlContainer(IMAGE).start();
 
     // Connect to the database
     let client = new Client({
@@ -60,7 +62,7 @@ describe("PostgreSqlContainer snapshot and restore", { timeout: 180_000 }, () =>
   // }
 
   it("should use custom snapshot name", async () => {
-    const container = await new PostgreSqlContainer().start();
+    const container = await new PostgreSqlContainer(IMAGE).start();
     const customSnapshotName = "my_custom_snapshot";
 
     // Connect to the database
@@ -110,7 +112,7 @@ describe("PostgreSqlContainer snapshot and restore", { timeout: 180_000 }, () =>
   });
 
   it("should handle multiple snapshots", async () => {
-    const container = await new PostgreSqlContainer().start();
+    const container = await new PostgreSqlContainer(IMAGE).start();
 
     // Connect to the database
     let client = new Client({
@@ -193,7 +195,7 @@ describe("PostgreSqlContainer snapshot and restore", { timeout: 180_000 }, () =>
   });
 
   it("should throw an error when trying to snapshot postgres system database", async () => {
-    const container = await new PostgreSqlContainer().withDatabase("postgres").start();
+    const container = await new PostgreSqlContainer(IMAGE).withDatabase("postgres").start();
 
     await expect(container.snapshot()).rejects.toThrow(
       "Snapshot feature is not supported when using the postgres system database"