feat(frontend): use runtime NEXT_PUBLIC_WEBAPP_URL to replace build-time frontend value

scripts/replace-placeholders.sh

@@ -0,0 +1,5 @@
+# Find and replace placeholder values with runtime-specific environment values
+find apps/web/.next/ apps/web/public -type f |
+while read file; do
+    sed -i "s|https://NEXT_PUBLIC_WEBAPP_URL_PLACEHOLDER|$NEXT_PUBLIC_WEBAPP_URL|g" "$file"
+done

scripts/start.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 set -x
 
+scripts/replace-placeholders.sh
 scripts/wait-for-it.sh ${DATABASE_HOST} -- echo "database is up"
 npx prisma migrate deploy --schema /calcom/packages/prisma/schema.prisma
 npx ts-node --transpile-only /calcom/packages/prisma/seed-app-store.ts