CI: Limit mdbook run to git-push to master (#32)

Ken Kawamoto · web-flow · commit 24b51e3451ba · 2020-06-18T08:30:26.000-07:00
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
@@ -1,7 +1,9 @@
 name: mdbook updater
 
 on:
-  push
+  push:
+    branches:
+      - master
 
 env:
   CARGO_TERM_COLOR: always
