ci: add basic github actions for build/release #22

	# https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions
	name: Build

	on:
	push:
	branches:
	- '**'
	tags-ignore:
	- '**'
	paths-ignore:
	- '*/.md'
	- '.github/*.yml'
	pull_request:
	workflow_dispatch:
	# https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/

	jobs:

	shellcheck:
	runs-on: ubuntu-latest
	steps:
	- name: Git Checkout
	uses: actions/checkout@v3 #https://github.com/actions/checkout

	- name: Install shellcheck
	run: sudo apt-get install -y bash shellcheck

	- name: Analyse with shellcheck
	run: \|
	shellcheck -V
	shellcheck --shell bash shepherd

	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Build Docker image
	run: docker build .

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