github: update CI workflow

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

.github/workflows/ci.yml

@@ -4,27 +4,34 @@ on:
   - push
   - pull_request
 
-env:
-  DEFAULT_PYTHON: 3.9
-
 jobs:
   pico:
     name: RPi Pico compilation
     runs-on: ubuntu-20.04
     steps:
-      - name: Check out code from GitHub
-        uses: actions/checkout@v2
+      - name: 'Check out code'
+        uses: actions/checkout@v3
 
-      - name: Install dependencies
+      - name: 'Install dependencies'
         run: |
           sudo apt-get install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi
 
-      - name: Generate RPi Pico binaries
+      - name: 'Update Submodules'
         run: |
-          ./build.sh
+          git submodule sync --recursive
+          git submodule update --init --recursive
 
-      - name: 'Upload RPi Pico binary'
-        uses: actions/upload-artifact@v2
+      - name: 'Configure'
+        run: |
+          mkdir -p build
+          cmake -B build
+
+      - name: 'Build'
+        run: |
+          make -C build
+
+      - name: 'Upload binary'
+        uses: actions/upload-artifact@v3
         with:
           name: pico-uart-bridge.uf2
           path: build/uart_bridge.uf2