ci: Trigger ci.yml for changes under pkg/contrib

This will catch changes to the likes of wasmtime and njs.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Author: ac000

.github/workflows/ci.yml

@@ -8,6 +8,7 @@ on:
       - 'go/**'
       - 'src/**'
       - 'test/**'
+      - 'pkg/contrib/**'
       - '.github/workflows/ci.yml'
   push:
     branches: master
@@ -17,6 +18,7 @@ on:
       - 'go/**'
       - 'src/**'
       - 'test/**'
+      - 'pkg/contrib/**'
       - '.github/workflows/ci.yml'
 
 jobs: