Add CI pipeline

.github/workflows/actions.yml

@@ -0,0 +1,29 @@
+name: Build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v1
+
+      - name: Install pio and its dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install platformio
+
+      - name: Run builds
+        run: python ./ci/build.py
+
+      - name: Upload binaries
+        uses: actions/upload-artifact@v2
+        with:
+          name: binaries
+          path: ./build/*.bin