Add CI workflow to do Arduino project-specific linting

On every push or pull request, run Arduino Lint to check for common problems not related to the project code.

Author: per1234

.github/workflows/arduino-lint.yml

@@ -0,0 +1,26 @@
+name: Arduino Lint
+on:
+  push:
+  pull_request:
+  # Scheduled trigger checks for breakage caused by new rules added to Arduino Lint
+  schedule:
+    # run every Saturday at 3 AM UTC
+    - cron: "0 3 * * 6"
+  # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#workflow_dispatch
+  workflow_dispatch:
+  # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#repository_dispatch
+  repository_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Arduino Lint
+        uses: arduino/arduino-lint-action@v1
+        with:
+          official: true
+          library-manager: update

README.adoc

@@ -5,6 +5,7 @@
 = {repository-name} =
 
 image:https://github.com/{repository-owner}/{repository-name}/workflows/Compile%20Examples/badge.svg["Compile Examples Status", link="https://github.com/{repository-owner}/{repository-name}/actions?workflow=Compile+Examples"]
+image:https://github.com/{repository-owner}/{repository-name}/workflows/Arduino%20Lint/badge.svg["Arduino Lint Status", link="https://github.com/{repository-owner}/{repository-name}/actions?workflow=Arduino+Lint"]
 image:https://github.com/{repository-owner}/{repository-name}/workflows/Spell%20Check/badge.svg["Spell Check Status", link="https://github.com/{repository-owner}/{repository-name}/actions?workflow=Spell+Check"]
 
 Arduino Library for the Atmel/Microchip ECC508 and ECC608 crypto chips