Add guide, backfill options (initial partition) #16

	name: PostgreSQL Installcheck

	on:
	pull_request:
	types: [opened, edited, reopened, review_requested]

	jobs:
	installcheck:
	strategy:
	matrix:
	pg_version: [14, 15, 16]
	os: [ubuntu-latest]

	runs-on: ${{matrix.os}}
	steps:
	- name: Add PGDG repo
	run: >
	sudo sh -c 'echo "deb https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list' &&
	sudo sh -c 'wget -qO - https://www.postgresql.org/media/keys/ACCC4CF8.asc \| gpg --dearmor > /etc/apt/trusted.gpg.d/apt.postgresql.org.gpg' &&
	sudo apt-get update

	- name: Install/modify postgresql-common
	run: >
	sudo apt-get install -y --no-install-recommends postgresql-common &&
	sudo sed -ri 's/#(create_main_cluster) .*$/\1 = false/' /etc/postgresql-common/createcluster.conf

	- name: Install PostgreSQL and server-dev
	run: >
	sudo apt-get install -y --no-install-recommends \
	postgresql-${{matrix.pg_version}} \
	postgresql-server-dev-${{matrix.pg_version}}

	- name: Install dependencies
	run: >
	sudo apt-get install -y --no-install-recommends \
	postgresql-${{matrix.pg_version}}-partman

	- uses: actions/checkout@v3

	- name: Install extension
	run: sudo make install

	- name: Start PostgreSQL
	run: >
	sudo pg_dropcluster 14 main &&
	sudo pg_createcluster ${{matrix.pg_version}} main --start -- -A trust

	- name: Test extension
	id: installcheck
	run: PGUSER=postgres PGCLUSTER=${{matrix.pg_version}}/main make installcheck

	- name: Display results
	if: failure() && steps.installcheck.outcome != 'success'
	run: cat regression.diffs

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