GH Actions: Adds manual trigger to run the QA jobs #33

	---

	name: Quality Assurance

	on:
	pull_request:
	push:
	workflow_dispatch:
	inputs:
	ref:
	description: A git reference to check out.
	default: 1.3.x
	required: true
	type: string

	jobs:
	tests:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest]
	python-version:
	- 2.7
	- pypy2
	- 3.5
	- 3.6
	- 3.7
	- 3.8
	- 3.9
	- pypy3
	include:
	- os: ubuntu-18.04
	python-version: 3.4
	steps:
	- uses: actions/checkout@v2
	with:
	ref: ${{ inputs.ref \|\| github.ref }}
	- uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip
	restore-keys: \|
	${{ runner.os }}-pip
	- run: python -m pip install --upgrade pip setuptools tox
	- run: tox -e py

	CodeQL:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	with:
	ref: ${{ inputs.ref \|\| github.ref }}
	- name: Initialize CodeQL
	uses: github/codeql-action/init@v1
	with:
	languages: 'python'
	- name: Perform CodeQL Analysis
	uses: github/codeql-action/analyze@v1

	other:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	include:
	- environment: doclinks
	- environment: doctest
	- environment: linting
	steps:
	- uses: actions/checkout@v2
	with:
	ref: ${{ inputs.ref \|\| github.ref }}
	- uses: actions/setup-python@v2
	- uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip
	restore-keys: \|
	${{ runner.os }}-pip
	- run: python -m pip install --upgrade pip setuptools tox
	- run: tox -e ${{ matrix.environment }}

	...

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