fix: handle forked repositories

apps/api/prisma/migrations/20221002091630_forked_previews/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Build" ADD COLUMN "sourceRepository" TEXT;

apps/api/prisma/schema.prisma

@@ -247,6 +247,7 @@ model Build {
   previewApplicationId String?
   forceRebuild         Boolean  @default(false)
   sourceBranch         String?
+  sourceRepository     String?
   branch               String?
   status               String?  @default("queued")
   createdAt            DateTime @default(now())