chore: use BACKSTAGE_VERSIONS_BASE_URL instead

Signed-off-by: Hellgren Heikki <heikki.hellgren@op.fi>

packages/yarn-plugin/README.md

@@ -29,7 +29,7 @@ backstage.json.
 
 The plugin functionality can be configured with environment variables:
 
-- `BACKSTAGE_MANIFEST_BASE_URL` - The base URL for fetching the Backstage version
+- `BACKSTAGE_VERSIONS_BASE_URL` - The base URL for fetching the Backstage version
   manifest. Defaults to `https://versions.backstage.io/v1/releases/VERSION/manifest.json`.
   Useful for running the plugin in environment without direct access to the internet,
   for example by using a mirror of the versions API or a proxy.

packages/yarn-plugin/src/util/getPackageVersion.test.ts

@@ -43,8 +43,6 @@ describe('getPackageVersion', () => {
   const mockConfiguration = {} as Configuration;
 
   beforeEach(() => {
-    jest.clearAllMocks();
-
     mockGetCurrentBackstageVersion.mockReturnValue('1.23.4');
     mockStructUtils.stringifyIdent.mockImplementation(
       (descriptor: any) =>
@@ -59,6 +57,10 @@ describe('getPackageVersion', () => {
     }));
   });
 
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
   describe('successful package resolution', () => {
     beforeEach(() => {
       mockHttpUtils.get.mockResolvedValue({
@@ -96,8 +98,8 @@ describe('getPackageVersion', () => {
     });
 
     it('uses custom versionsBaseUrl from environment when provided', async () => {
-      const originalEnv = process.env.BACKSTAGE_MANIFEST_BASE_URL;
-      process.env.BACKSTAGE_MANIFEST_BASE_URL = 'https://custom.example.com';
+      const originalEnv = process.env.BACKSTAGE_VERSIONS_BASE_URL;
+      process.env.BACKSTAGE_VERSIONS_BASE_URL = 'https://custom.example.com';
 
       const descriptor = {
         scope: '@backstage',
@@ -113,7 +115,7 @@ describe('getPackageVersion', () => {
         fetch: expect.any(Function),
       });
 
-      process.env.BACKSTAGE_MANIFEST_BASE_URL = originalEnv;
+      process.env.BACKSTAGE_VERSIONS_BASE_URL = originalEnv;
     });
 
     it('uses yarn httpUtils for fetching with proper response format', async () => {

packages/yarn-plugin/src/util/getPackageVersion.ts

@@ -52,7 +52,7 @@ export const getPackageVersion = async (
     ? await xfs.readJsonSync(manifestFile as PortablePath)
     : await getManifestByVersion({
         version: backstageVersion,
-        versionsBaseUrl: env.BACKSTAGE_MANIFEST_BASE_URL,
+        versionsBaseUrl: env.BACKSTAGE_VERSIONS_BASE_URL,
         // We override the fetch function used inside getManifestByVersion with a
         // custom implementation that calls yarn's built-in `httpUtils` method
         // instead. This has a couple of benefits: