Remove the GitHub-only CI config

Every one of the five workflows was boilerplate whose entire body was a call to
a reusable workflow hosted at LedgerHQ/ledger-app-workflows. Gitea cannot
resolve a GitHub-hosted reusable workflow, so they could only ever appear as
broken runs: build_and_functional_tests, coding_style_checks,
guidelines_enforcer, misspellings_checks and python_tests_checks.

dependabot.yml goes with them, since Gitea does not read it either.

Kept .github/PULL_REQUEST_TEMPLATE.md, which Gitea does support, and
copilot-instructions.md, which is documentation rather than CI.

tests/README.md no longer points at the workflow for regenerating snapshots;
./scripts/test <device> --golden_run is the only route now.

There is no automated CI after this. ./scripts/test runs the full suite against
speculos in Docker, 66 tests on each of the five devices.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.github/dependabot.yml

@@ -1,14 +0,0 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
-
-version: 2
-updates:
-  - package-ecosystem: "cargo" # See documentation for possible values
-    directory: "/" # Location of package manifests
-    schedule:
-      interval: "daily"
-    allow:
-      - dependency-name: "ledger_device_sdk"
-      - dependency-name: "include_gif"

.github/workflows/build_and_functional_tests.yml

@@ -1,50 +0,0 @@
-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: write
-  actions: write
-  pull-requests: write
-
-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_handshake_binaries"
-      builder: ledger-app-builder
-
-  tests_standalone:
-    name: Run standalone ragger tests using the reusable workflow
-    needs: build_application
-    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_ragger_tests.yml@v1
-    with:
-      download_app_binaries_artifact: "app_handshake_binaries"
-      regenerate_snapshots: ${{ github.event_name == 'workflow_dispatch' && inputs.golden_run == 'Open a PR' }}
-      test_dir: "tests/standalone"

.github/workflows/coding_style_checks.yml

@@ -1,24 +0,0 @@
-name: Run coding style check
-
-# This workflow will run linting checks to ensure a level of code quality among all Ledger applications.
-#
-# The presence of this workflow is mandatory as a minimal level of linting is required.
-
-permissions:
-  contents: read
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - master
-      - main
-      - develop
-  pull_request:
-
-jobs:
-  check_linting:
-    name: Check linting using the reusable workflow
-    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_lint.yml@v1
-    with:
-      source: './src'

.github/workflows/guidelines_enforcer.yml

@@ -1,27 +0,0 @@
-name: Ensure compliance with Ledger guidelines
-
-# This workflow is mandatory in all applications
-# It calls a reusable workflow guidelines_enforcer developed by Ledger's internal developer team.
-# The successful completion of the reusable workflow is a mandatory step for an app to be available on the Ledger
-# application store.
-#
-# More information on the guidelines can be found in the repository:
-# LedgerHQ/ledger-app-workflows/
-
-permissions:
-  contents: read
-  actions: write
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - master
-      - main
-      - develop
-  pull_request:
-
-jobs:
-  guidelines_enforcer:
-    name: Call Ledger guidelines_enforcer
-    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_guidelines_enforcer.yml@v1

.github/workflows/misspellings_checks.yml

@@ -1,22 +0,0 @@
-name: Misspellings checks
-
-# This workflow performs some misspelling checks on the repository
-# It is there to help us maintain a level of quality in our codebase and does not have to be kept on forked
-# applications.
-
-permissions:
-  contents: read
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - master
-      - main
-      - develop
-  pull_request:
-
-jobs:
-  misspell:
-    name: Check misspellings
-    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_spell_check.yml@v1

.github/workflows/python_tests_checks.yml

@@ -1,28 +0,0 @@
-name: Checks on the Python tests
-permissions:
-  contents: read
-
-# This workflow performs some checks on the Python client used by the ragger tests
-# It is there to help us maintain a level of quality in our codebase and does not have to be kept on forked
-# applications.
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - master
-      - main
-      - develop
-  pull_request:
-
-jobs:
-  lint:
-    name: Call Ledger Python linters
-    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_python_checks.yml@v1
-    with:
-      run_linter: pylint
-      run_type_check: true
-      src_directory: application_client
-      setup_directory: tests
-      req_directory: tests
-