Update test GHA

Author: kushalbakshi

.github/workflows/test.yaml

@@ -1,10 +1,12 @@
 name: Test
 on:
   push:
+    branches:
+      - main
   pull_request:
+    branches:
+      - main
   workflow_dispatch:
-  schedule:
-    - cron: "0 8 * * 1"
 jobs:
   devcontainer-build:
     uses: datajoint/.github/.github/workflows/devcontainer-build.yaml@main
@@ -29,4 +31,3 @@ jobs:
           python_version=${{matrix.py_ver}}
           black element_calcium_imaging --check --verbose --target-version py${python_version//.}
           black notebooks --check --verbose --target-version py${python_version//.}
-