ci: adjust job triggers (#94)

Author: faustbrian

.github/workflows/test.yml

@@ -1,9 +1,14 @@
 name: Test
 
-on: [push, pull_request]
+on:
+    push:
+        branches:
+            - '**'
+    pull_request:
+        types: [opened]
 
 jobs:
-  build:
+  unit:
     runs-on: ubuntu-latest
     strategy:
       max-parallel: 4