chore: zizmor action for PRs (#85)

Author: jfagoagas

.github/workflows/zizmor.yml

@@ -4,9 +4,13 @@ on:
   push:
     branches:
       - "main"
+    paths:
+      - ".github/workflows/**"
   pull_request:
     branches:
-      - "**"
+      - "main"
+    paths:
+      - ".github/workflows/**"
 
 permissions: {}