.github: Skip unnecessary docs test

We don't need to run documentation tests if the documentation is
untouched.

Signed-off-by: Paul Chaignon <paul@cilium.io>

.github/workflows/docs.yaml

@@ -2,10 +2,26 @@ name: Documentation Updates
 
 # Any change in triggers needs to be reflected in the concurrency group.
 on:
-  pull_request: {}
+  pull_request:
+    paths:
+      - 'Documentation/**'
+      - 'bugtool/cmd/**'
+      - 'cilium/cmd/**'
+      - 'cilium-health/cmd/**'
+      - 'daemon/cmd/**'
+      - 'hubble-relay/cmd/**'
+      - 'operator/cmd/**'
   push:
     branches:
       - master
+    paths:
+      - 'Documentation/**'
+      - 'bugtool/cmd/**'
+      - 'cilium/cmd/**'
+      - 'cilium-health/cmd/**'
+      - 'daemon/cmd/**'
+      - 'hubble-relay/cmd/**'
+      - 'operator/cmd/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.event.after }}