Test examples building in CI

Author: okalachev

.github/workflows/build.yaml

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+name: Build
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install Arduino CLI
+      uses: arduino/setup-arduino-cli@v1.1.1
+    - name: ZIP library
+      run: zip -r FlixPeriph.zip .
+    - name: Install arduino-cli.yaml
+      run: cp .github/workflows/arduino-cli.yaml ./
+    - name: Install ESP32 core
+      run: |
+        arduino-cli core update-index --config-file arduino-cli.yaml
+        arduino-cli core install esp32:esp32
+    - name: Install library
+      run: arduino-cli lib install --zip-path FlixPeriph.zip --config-file arduino-cli.yaml
+    - name: Build MPU9250 example for ESP32
+      run: cd examples/MPU9250 && arduino-cli compile --fqbn esp32:esp32:esp32
+    - name: Build MPU9250 example for ESP32 D1 Mini
+      run: cd examples/MPU9250 && arduino-cli compile --fqbn esp32:esp32:d1_mini

.github/workflows/fixtures/arduino-cli.yaml

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+board_manager:
+	additional_urls:
+	  - https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
+  library:
+	enable_unsafe_install: true