tbot/main.py: Allow Shell variables also in argumentfiles #332

	name: tbot selftest CI

	on:
	push:
	branches:
	- master
	- wip
	pull_request:

	jobs:
	test:
	name: Lint and Test
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v2
	- name: Install Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.7
	- name: Install dependencies, linters, doc-tools
	run: \|
	python -m pip install --upgrade pip
	pip install pytest mypy paramiko termcolor2 pyserial
	- name: Run pre-commit hooks for all files
	uses: pre-commit/[email protected]
	with:
	extra_args: --all-files --verbose
	env:
	SKIP: selftests
	- name: Run tbot selftests
	run: \|
	export COLUMNS=160
	python -m pytest -v --color=yes selftest/
	- name: Run tbot extended selftests
	run: \|
	export CLICOLOR_FORCE=1
	python -m tbot.main -vv selftest_tc

Provide feedback