github action to only test the code of the current branch

.github/workflows/esp_idf.yml

@@ -18,6 +18,7 @@ jobs:
     - name: Checkout repo
       uses: actions/checkout@v4
       with:
+        ref: ${{ github.ref }}
         submodules: 'recursive'
     - name: ESP-IDF v5.1 build
       uses: ./.github/actions/esp-idf-with-node
@@ -34,6 +35,7 @@ jobs:
     - name: Checkout repo
       uses: actions/checkout@v4
       with:
+        ref: ${{ github.ref }}
         submodules: 'recursive'
     - name: ESP-IDF v5.2 build
       uses: ./.github/actions/esp-idf-5_2-with-node