feat: use ledger in txn sign

.github/workflows/ledger-emulator.yml

@@ -0,0 +1,24 @@
+name: Ledger Emulator Tests
+
+on:
+  push:
+    branches: [main, release/**]
+  pull_request:
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  emulator-tests:
+    runs-on: ubuntu-latest
+    env:
+      CI_TESTS: true
+    steps:
+    - uses: actions/checkout@v3
+    - uses: stellar/actions/rust-cache@main
+    - name: install libudev-dev
+      run: |
+        sudo apt install -y libudev-dev
+    - run: |
+        cargo test --manifest-path cmd/crates/stellar-ledger/Cargo.toml --features "emulator-tests"

.gitignore

@@ -4,3 +4,4 @@ captive-core/
 !test.toml
 *.sqlite
 test_snapshots
+.env