test: align imageRef selftests with Aipod spec source

src/selftest/harness.ts

@@ -1,10 +1,11 @@
-import { chmod, mkdtemp, mkdir, writeFile, rm } from "node:fs/promises";
+import { chmod, mkdtemp, mkdir, readFile, writeFile, rm } from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 import assert from "node:assert/strict";
 import { ManagerClient } from "../mgr/client.js";
-import type { BackendProfile, JsonRecord } from "../common/types.js";
+import type { AipodImageRef, BackendProfile, JsonRecord } from "../common/types.js";
 import { backendProfileSpec } from "../common/backend-profiles.js";
+import { parseAipodSpecYaml } from "../common/aipod-specs.js";
 import { dsflashGoModelCatalogJson } from "../common/model-catalogs.js";
 
 export interface SelfTestContext {
@@ -133,6 +134,12 @@ export function profileSecretHome(context: Pick<SelfTestContext, "codexHome"> &
   return context.codexHome;
 }
 
+export async function loadArtificerImageRef(root: string): Promise<AipodImageRef> {
+  const text = await readFile(path.join(root, "config", "aipods", "artificer.yaml"), "utf8");
+  const spec = parseAipodSpecYaml(text, "selftest-artificer-image-ref");
+  return spec.spec.imageRef;
+}
+
 function defaultFakeCommand(): string {
   return process.versions.bun ? process.execPath : "npx";
 }