Add "smoke test" examples compilation CI workflow

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

Because this library doesn't currently have any example sketches, the Mouse built-in example sketches are used. This is
an artifact from a time when the Mouse functionality was part of the core library, rather than a standalone library.

Author: per1234

.github/workflows/compile-examples.yml

@@ -0,0 +1,78 @@
+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"
+      - "examples/**"
+      - "src/**"
+  pull_request:
+    paths:
+      - ".github/workflows/compile-examples.yml"
+      - "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:avr:leonardo
+            platforms: |
+              - name: arduino:avr
+          - fqbn: arduino:sam:arduino_due_x_dbg
+            platforms: |
+              - name: arduino:sam
+          - fqbn: arduino:samd:arduino_zero_edbg
+            platforms: |
+              - name: arduino:samd
+          - fqbn: arduino:samd:mkrzero
+            platforms: |
+              - name: arduino:samd
+          - fqbn: arduino:samd:nano_33_iot
+            platforms: |
+              - name: arduino:samd
+          - fqbn: arduino:mbed_portenta:envie_m7
+            platforms: |
+              - name: arduino:mbed_portenta
+          - fqbn: arduino:mbed_nano:nano33ble
+            platforms: |
+              - name: arduino:mbed_nano
+          - fqbn: arduino:mbed_nano:nanorp2040connect
+            platforms: |
+              - name: arduino:mbed_nano
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Checkout built-in examples
+        uses: actions/checkout@v2
+        with:
+          repository: arduino/arduino-examples
+          path: ${{ env.BUILT_IN_EXAMPLES_PATH }}
+
+      - 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: ./
+            # Additional library dependencies can be listed here.
+            # See: https://github.com/arduino/compile-sketches#libraries
+          sketch-paths: |
+            - ${{ env.BUILT_IN_EXAMPLES_PATH }}/examples/09.USB/Mouse

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"]
 
 This library allows an Arduino board with USB capabilities to act as a Mouse.