Add CI workflow to ensure ethereum SDK is up to date

.github/workflows/check_sdk.yml

@@ -0,0 +1,16 @@
+---
+name: Check SDK submodule version
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  job_check_SDK:
+    name: Check Ethereum plugin SDK submodule is up-to-date
+    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_check_ethereum_sdk.yml@v1