Fixing build action triggers

Rationale:
Kuksa-val build was triggered too often,

But then, should we not trigger when certs and proto files are changed as well
(Even if some use symbolic links)

.github/workflows/kuksa-client.yml

@@ -21,6 +21,8 @@ on:
     paths:
     - ".github/workflows/kuksa-client.yml"
     - "kuksa-client/**"
+    - "kuksa_certificates/**"
+    - "proto/**"
   workflow_dispatch:
 
 jobs: