Add reg::io_addr() and AVR_IO_SFR_OFFSET #21

	# This is a basic workflow to help you get started with Actions

	name: 'demos'

	# Controls when the action will run.
	on:
	# Triggers the workflow on push or pull request events but only for the main branch
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@main

	- name: Build docker image
	run: docker build -t avr-gcc -f .github/workflows/Dockerfile .

	- name: Build demos
	run: docker run -v $(pwd):/build -w/build avr-gcc make -B demo

Provide feedback