add reusable build

.github/workflows/build_and_functional_tests.yml

@@ -0,0 +1,38 @@
+name: Build and run functional tests using ragger through reusable workflow
+
+# This workflow will build the app and then run functional tests using the Ragger framework upon Speculos emulation.
+# It calls a reusable workflow developed by Ledger's internal developer team to build the application and upload the
+# resulting binaries.
+# It then calls another reusable workflow to run the Ragger tests on the compiled application binary.
+#
+# The build part of this workflow is mandatory, this ensures that the app will be deployable in the Ledger App Store.
+# While the test part of this workflow is optional, having functional testing on your application is mandatory and this workflow and
+# tooling environment is meant to be easy to use and adapt after forking your application
+
+permissions:
+  contents: read
+
+on:
+  workflow_dispatch:
+    inputs:
+      golden_run:
+        type: choice
+        required: true
+        default: 'Raise an error (default)'
+        description: CI behavior if the test snapshots are different than expected.
+        options:
+          - 'Raise an error (default)'
+          - 'Open a PR'
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  build_application:
+    name: Build application using the reusable workflow
+    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_build.yml@v1
+    with:
+      upload_app_binaries_artifact: "app_aeternity_binaries"