Use ubuntu latest for CI unit tests

.github/workflows/rust.yml

@@ -65,12 +65,25 @@ jobs:
   test:
     name: Run unit tests
     runs-on: ubuntu-latest
-    container:
-        image: ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest
     strategy:
       matrix:
-        target: ["nanos", "nanox", "nanosplus"]
+        target: ["nanos"]
     steps:
+      - name: arm-none-eabi-gcc
+        uses: fiam/[email protected]
+        with:
+          release: '9-2019-q4'
+      - name: Install clang
+        run: sudo apt-get update && sudo apt install -y clang
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+          components: rust-src
+      - name: Install dependencies
+        run: |
+          sudo apt-get update && sudo apt-get install -y qemu-user-static
+          pip install speculos --extra-index-url https://test.pypi.org/simple/
       - name: Clone
         uses: actions/checkout@v2
       - name: Unit tests