ci/cd: trigger on all push events

Updated the workflow to trigger on all push events and not pull request
events so that push events on branches by the generate workflow will
trigger CI/CD and not hang the pull request for review.

Related to #292.

Author: sudomateo

.github/workflows/build-test.yml

@@ -1,9 +1,6 @@
 name: build & test
 on:
   push:
-    branches: [main]
-  pull_request:
-    branches: [main]
 jobs:
   build-test:
     runs-on: ubuntu-latest