fix: update preview_host calculation to use app_host

Author: Contentstack-AnkitaD

.env.sample

@@ -8,7 +8,7 @@ CONTENTSTACK_ENVIRONMENT=your_environment_token
 
 # Below config options are for enabling live preview/live edit tags for the starter app
 
-CONTENTSTACK_PREVIEW_HOST= rest-preview.contentstack.com
+# CONTENTSTACK_PREVIEW_HOST= rest-preview.contentstack.com  -- it will be generated runtime from CONTENTSTACK_APP_HOST
 CONTENTSTACK_PREVIEW_TOKEN= your_live_preview_token
 CONTENTSTACK_APP_HOST=app.contentstack.com
 CONTENTSTACK_LIVE_PREVIEW= true

.talismanrc

@@ -2,4 +2,8 @@ fileignoreconfig:
 - filename: .github/workflows/secrets-scan.yml
   ignore_detectors:
     - filecontent
+- filename: .env.sample
+  checksum: 5cb7389df244ea0f5c62e6f156ea038d0725e46d52662ca479e671108bdd966b
+- filename: setenv.ts
+  checksum: 243eb74a14fc02eaacd1e632b498387b946b929807ff8687931bb1e530002541
 version: "1.0"

setenv.ts

@@ -11,6 +11,12 @@ const stackConfig = {
   branch: process.env.CONTENTSTACK_BRANCH || 'main',
   region: process.env.CONTENTSTACK_REGION || 'us',
 };
+
+// Calculate preview_host from app_host if available and preview_host is not explicitly set
+const appHost = process.env.CONTENTSTACK_APP_HOST;
+const previewHost = process.env.CONTENTSTACK_PREVIEW_HOST || 
+                   (appHost ? appHost.replace('app', 'rest-preview') : undefined);
+
 const environmentFileContent = `
 export const environment = {
   production: true
@@ -23,7 +29,7 @@ export const Config = {
   branch: '${process.env.CONTENTSTACK_BRANCH || 'main'}',
   region: '${process.env.CONTENTSTACK_REGION || 'us'}',
   preview_token:'${process.env.CONTENTSTACK_PREVIEW_TOKEN}',
-  preview_host:'${process.env.CONTENTSTACK_PREVIEW_HOST}',
+  preview_host:'${previewHost}',
   api_host:'${process.env.CONTENTSTACK_API_HOST}',
   app_host:'${process.env.CONTENTSTACK_APP_HOST}',
   live_preview:${process.env.CONTENTSTACK_LIVE_PREVIEW || true}