Add "smoke test" examples compilation CI workflow

On every push or pull request that affects library source or example files, and periodically, compile all example
sketches for the specified boards.

Author: per1234

.github/workflows/compile-examples.yml

@@ -0,0 +1,66 @@
+name: Compile Examples
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/compile-examples.yml"
+      - "library.properties"
+      - "examples/**"
+      - "src/**"
+  pull_request:
+    paths:
+      - ".github/workflows/compile-examples.yml"
+      - "library.properties"
+      - "examples/**"
+      - "src/**"
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to external resources (libraries, platforms).
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  build:
+    name: ${{ matrix.board.fqbn }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        board:
+          - fqbn: arduino:mbed_nano:nano33ble
+            platforms: |
+              - name: arduino:mbed_nano
+            libraries: |
+              - name: Arduino_APDS9960
+              - name: Arduino_HTS221
+              - name: Arduino_LPS22HB
+              - name: Arduino_LSM9DS1
+            sketch-paths: examples/Nano33BLESenseFirmware
+          - fqbn: arduino:samd:mkrwifi1010
+            platforms: |
+              - name: arduino:samd
+            libraries: |
+              - name: ArduinoBLE
+              - name: Adafruit LSM9DS1 Library
+            sketch-paths: examples/PhysicsLabFirmware
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Compile examples
+        uses: arduino/compile-sketches@v1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          fqbn: ${{ matrix.board.fqbn }}
+          platforms: ${{ matrix.board.platforms }}
+          libraries: |
+            # Install the library from the local path.
+            - source-path: ./
+            # Board-specific library dependencies
+            ${{ matrix.board.libraries }}
+          sketch-paths: |
+            ${{ matrix.board.sketch-paths }}

README.adoc

@@ -4,6 +4,7 @@
 = {repository-name} Library for Arduino =
 
 image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml/badge.svg["Check Arduino status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml"]
+image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml/badge.svg["Compile Examples status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml"]
 image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml/badge.svg["Spell Check status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml"]
 
 Firmware for the Physics Lab kit and the Arduino Nano 33 BLE Sense.