temporarily disable PR CI trigger

* I don't want my commits to spam the upstream repo with lots of failed action jobs for my incomplete PR
* prevent accidentally creating a release (shouldn't happen with the modified workflow in the head branch (github uses base branch workflows) but you never know)

.github/workflows/build.yml

@@ -3,9 +3,10 @@ on:
   push:
     paths-ignore:
       - "**.md"
-  pull_request:
-    paths-ignore:
-      - "**.md"
+# TODO turn PR trigger back on
+#   pull_request:
+#     paths-ignore:
+#       - "**.md"
 
 env:
   is_stable: |