ci: also run on dev (push + PR), not just main (#3)

Part of the org-wide dev/main release-cycle standardization: dev is now
where work lands and CI must actually run there, not just on main.

Author: MattJackson

.github/workflows/lint-test.yml

@@ -4,6 +4,7 @@ on:
   pull_request:
     branches:
       - main
+      - dev
 
 jobs:
   lint-test: