Refactor github actions tests (#688)

.github/workflows/test-piper-phonemize.yaml

@@ -3,6 +3,19 @@ on:
   push:
     branches:
       - master
+    paths:
+      - '.github/workflows/test-piper-phonemize.yaml'
+      - 'CMakeLists.txt'
+      - 'cmake/**'
+      - 'sherpa-onnx/csrc/*'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/test-piper-phonemize.yaml'
+      - 'CMakeLists.txt'
+      - 'cmake/**'
+      - 'sherpa-onnx/csrc/*'
 
   workflow_dispatch:
 
@@ -10,7 +23,6 @@ concurrency:
   group: test-piper-phonemize-${{ github.ref }}
   cancel-in-progress: true
 
-
 jobs:
   test_piper_phonemize:
     name: ${{ matrix.os }} ${{ matrix.build_type }} ${{ matrix.shared_lib }}