diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index da6a52e3..b511d94e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,6 +6,8 @@ on:
     branches: ["master"]
   pull_request:
     branches: ["master"]
+  # Allow rebuilds via API.
+  on: "repository_dispatch"
 
 jobs:
   tests: