ci: only run tests if source, dependency or workflow files change (#20)

Author: kangasta

.github/workflows/test.yml

@@ -4,9 +4,19 @@ on:
   pull_request:
     branches:
     - main
+    paths:
+    - '**.go'
+    - 'go.mod'
+    - 'go.sum'
+    - '.github/workflows/test.yml'
   push:
     branches:
     - main
+    paths:
+    - '**.go'
+    - 'go.mod'
+    - 'go.sum'
+    - '.github/workflows/test.yml'
 
 permissions:
   contents: read