Apparently checkout before using a local workflow

.github/workflows/build_esp32.yml

@@ -11,13 +11,6 @@ jobs:
   build-esp32:
     runs-on: ubuntu-latest
       steps:
-        - name: Checkout code
-          uses: actions/checkout@v3
-          with:
-            submodules: "recursive"
-            ref: ${{github.event.pull_request.head.ref}}
-            repository: ${{github.event.pull_request.head.repo.full_name}}
-
         - name: Setup Python
           uses: actions/setup-python@v4
           with:

.github/workflows/main_matrix.yml

@@ -97,6 +97,13 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout code
+          uses: actions/checkout@v3
+          with:
+            submodules: "recursive"
+            ref: ${{github.event.pull_request.head.ref}}
+            repository: ${{github.event.pull_request.head.repo.full_name}}
+
       - uses: ./.github/workflows/build_esp32.yml
         with:
           board: ${{ matrix.board }}