[add] Building the app + running the C tests

.clang-format

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+---
+BasedOnStyle: Google
+IndentWidth: 4
+---
+Language: Cpp
+ColumnLimit: 100
+PointerAlignment: Right
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: true
+AllowAllParametersOfDeclarationOnNextLine: false
+SortIncludes: false
+SpaceAfterCStyleCast: true
+AllowShortCaseLabelsOnASingleLine: false
+AllowAllArgumentsOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: Never
+AllowShortFunctionsOnASingleLine: None
+BinPackArguments: false
+BinPackParameters: false
+---

.github/workflows/ci-workflow.yml

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+name: Compilation & tests
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    branches:
+      - master
+      - develop
+
+jobs:
+  job_nanoS_build_debug:
+    name: Build debug app for NanoS
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest
+    steps:
+      - name: Clone
+        uses: actions/checkout@v2
+      - name: Build
+        run: |
+          make DEBUG=1
+      - name: Upload app binary
+        uses: actions/upload-artifact@v2
+        with:
+          name: app-nanoS-debug
+          path: bin
+
+  job_nanoX_build_debug:
+    name: Build debug app for NanoX
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest
+    steps:
+      - name: Clone
+        uses: actions/checkout@v2
+      - name: Build
+        run: |
+          make DEBUG=1 BOLOS_SDK=$NANOX_SDK
+      - name: Upload app binary
+        uses: actions/upload-artifact@v2
+        with:
+          name: app-nanoX-debug
+          path: bin
+
+  job_scan_build:
+    name: Clang Static Analyzer
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build with Clang Static Analyzer
+        run: |
+          make clean
+          scan-build --use-cc=clang -analyze-headers -enable-checker security -enable-checker unix -enable-checker valist -o scan-build --status-bugs make default
+      - uses: actions/upload-artifact@v2
+        if: failure()
+        with:
+          name: scan-build
+          path: scan-build
+
+  job_C_test:
+    name: C tests
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest
+    steps:
+      - name: Clone
+        uses: actions/checkout@v2
+      - name: Build unit tests
+        run: make -C libsol