CI - Build Micropython with LVGL submodule (#1771)

.github/workflows/build_micropython.yml

@@ -0,0 +1,40 @@
+name: Build Micropython with LVGL submodule
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Install SDL
+      run: |
+        sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu `lsb_release -sc` main universe restricted multiverse"
+        sudo apt-get update -y -qq
+        sudo apt-get install libsdl2-dev
+    - name: Clone lv_micropython
+      run: git clone https://github.com/lvgl/lv_micropython.git .
+    - name: Update submodules
+      run: git submodule update --init --recursive
+    - name: Checkout lv_bindings
+      working-directory: ./lib/lv_bindings/lvgl
+      run: |
+        git fetch
+        git checkout $GITHUB_SHA
+    - name: Build mpy-cross
+      run: make -j $(nproc) -C mpy-cross
+    - name: Build the unix port
+      run: make -j $(nproc) -C ports/unix
+    - name: Run advanced_demo
+      run: >
+        echo "import gc,utime;
+        utime.sleep(5);
+        gc.collect();
+        utime.sleep(5)" | 
+        ports/unix/micropython -i lib/lv_bindings/examples/advanced_demo.py
+