Add get_placeholder to handle automatic check constraint evaluation #36

	name: django-postgresql-netfields

	on:
	- push
	- pull_request

	jobs:
	prepare:
	runs-on: ubuntu-latest
	steps:
	- name: Create matrix
	uses: fabiocaccamo/create-matrix-action@v2
	id: create_matrix
	with:
	matrix: \|
	python-version {2.7}, tox-env {py27-django111}
	python-version {3.7}, tox-env {py37-django111,py37-django22,py37-django30,py37-django31,py37-django32}
	python-version {3.8}, tox-env {py38-django111,py38-django22,py38-django30,py38-django31,py38-django32,py38-django40,py38-django41,py38-django42}
	python-version {3.9}, tox-env {py39-django111,py39-django22,py39-django30,py39-django31,py39-django32,py39-django40,py39-django41,py39-django42}
	python-version {3.10}, tox-env {py310-django32,py310-django40,py310-django41,py310-django42}
	python-version {3.11}, tox-env {py311-django41,py311-django42,py311-django42-psycopg3,py311-django42-psycopg3}
	outputs:
	matrix: ${{ steps.create_matrix.outputs.matrix }}
	build:
	runs-on: ubuntu-latest
	needs: prepare
	strategy:
	fail-fast: false
	matrix:
	include: ${{fromJson(needs.prepare.outputs.matrix)}}
	steps:
	- uses: actions/checkout@v1
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	sudo apt install postgresql libpq-dev
	sudo service postgresql start
	sudo -u postgres createuser -d runner
	python -m pip install --upgrade pip
	python -m pip install tox
	- name: Test with tox
	run: tox -e ${{ matrix.tox-env }}

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