Y333/poseidon support

.github/workflows/rust_fmt.yml

@@ -15,18 +15,11 @@ env:
 jobs:
   rust_fmt:
     runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest 
     steps:
       - name: Checkout
         uses: actions/checkout@v3
 
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          override: true
-          components: rustfmt
-
       - name: Cargo fmt
-        uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check
+        run: cargo fmt --all -- --check