Use Arduino-CI/action@stable-1.x (#8)

Update test to use stable-1.x of the Arduino-CI action.

Author: James Foster

.github/workflows/arduino_ci.yml

@@ -0,0 +1,13 @@
+---
+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  arduino_ci:
+    runs-on: ubuntu-latest
+    env:
+      CUSTOM_INIT_SCRIPT: scripts/install_libraries.sh
+    steps:
+      - uses: actions/checkout@v2
+      - uses: Arduino-CI/action@stable-1.x

.github/workflows/max.yaml

@@ -1,21 +1,11 @@
 #!/bin/bash
+# arduino_ci runs this script in its GitHub Action because it is referenced by CUSTOM_INIT_SCRIPT
+# arduino_ci ensures that the script is run in the libraries directory
 
-# this script has two use cases
-# 1 - CI testing and local development of this library only (SHALLOW)
-# 2 - Development of this library AND the supporting libraries
-# comment this out if you want full depth for the supporting libraries (case 2)
 export SHALLOW='--depth 1 --branch master --single-branch '
-# use this if you started with SHALLOW and now want the full repository with history
+# If you want the full repository with history, execute the following
 # git fetch --unshallow
 
-# ensure we have `arduino_ci`
-bundle config --local path vendor/bundle
-bundle install
-
-# set up directories
-bundle exec ensure_arduino_installation.rb
-cd $(bundle exec arduino_library_location.rb)
-
 # add missing libraries
 export GITHUB="https://github.com/Arduino-CI"
 if [ ! -d "./Adafruit_BusIO" ] ; then