build the container for multiple PostgreSQL versions #4

	name: Container

	on:
	- pull_request
	- push

	permissions:
	contents: read

	jobs:
	container:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	postgresql:
	- 12
	- 13
	- 15
	steps:
	- uses: actions/checkout@v4
	- name: Build container
	uses: docker/build-push-action@v5
	with:
	file: Containerfile
	tags: postgresql-evr:${{ matrix.postgresql }}
	build-args: \|
	POSTGRESQL_VERSION=${{ matrix.postgresql }}
	- name: Run container
	run: docker run -p 5432:5432 -e POSTGRES_PASSWORD=password --detach --name postgres postgresql-evr:${{ matrix.postgresql }}
	- name: Wait for the container to start up
	run: 'while ! docker exec postgres pg_isready; do sleep 1; done'
	- name: Create extension in the container
	run: psql --host localhost --username postgres --command 'create extension evr;'
	env:
	PGPASSWORD: password

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