add nginx src into example test trigger path (opea-project#1474)

Signed-off-by: chensuyue <[email protected]>

Author: chensuyue

.github/workflows/pr-examples-test.yml

@@ -12,6 +12,7 @@ on:
       - comps/cores/**
       - comps/dataprep/src/redis/langchain/**
       - comps/retrievers/src/redis/langchain/**
+      - comps/third_parties/nginx/src/**
       - requirements.txt
       - "!**.md"