add explicit reference to ubuntu set up page on install page #505

	name: Doc QA
	on:
	# Triggers the workflow on pull request events for the main branch
	pull_request_target:
	types:
	- opened

	permissions:
	pull-requests: write

	jobs:
	pyspell:
	runs-on: ubuntu-latest
	steps:
	# Spellcheck
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- uses: igsekor/[email protected]
	name: Spellcheck

	doctor-rst:
	name: Lint (DOCtor-RST)
	runs-on: ubuntu-latest
	steps:
	- name: "Checkout"
	uses: actions/checkout@v4

	- name: "Create cache dir"
	run: mkdir .cache

	- name: "Extract base branch name"
	run: echo "branch=${GITHUB_BASE_REF:-${GITHUB_REF##*/}}"
	id: extract_base_branch

	- name: "Cache DOCtor-RST"
	uses: actions/cache@v4
	with:
	path: .cache
	key: ${{ runner.os }}-doctor-rst-${{ steps.extract_base_branch.outputs.branch }}

	- name: "Run DOCtor-RST"
	uses: docker://oskarstark/doctor-rst:1.23.0
	with:
	args: --short --error-format=github --cache-file=/github/workspace/.cache/doctor-rst.cache

	documentation-preview:
	runs-on: ubuntu-latest
	steps:
	- uses: readthedocs/actions/preview@v1
	with:
	project-slug: "datacube-core"

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