only start github actions when push to master/main

.github/workflows/idf.yml

@@ -1,3 +1,10 @@
+on:
+  push:
+    branches:
+      - 'master'
+    paths:
+      - 'main/**'
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -7,7 +14,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         submodules: 'recursive'
-    - name: esp-idf build
+    - name: ESP-IDF build
       uses: espressif/esp-idf-ci-action@v1
       with:
         esp_idf_version: v5.4