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Add treescanr R package MVP, devcontainer, and CI (#1) #3

	# R CMD check inside the private dev image, which includes TreeScan(TM) so the
	# full pipeline test (ts_run) is exercised. Pull requests from forks cannot
	# pull the private image.
	name: R-CMD-check

	on:
	push:
	branches: [main]
	pull_request:
	workflow_dispatch:

	permissions:
	contents: read
	packages: read

	jobs:
	R-CMD-check:
	runs-on: ubuntu-latest
	container:
	image: ghcr.io/epiforesite/treescanr-dev:latest
	credentials:
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	steps:
	- uses: actions/checkout@v4

	- name: Build
	run: R CMD build .

	- name: Check
	env:
	_R_CHECK_CRAN_INCOMING_: false
	run: R CMD check --no-manual --as-cran treescanr_*.tar.gz

	- name: Show test output
	if: always()
	run: find treescanr.Rcheck -name '.Rout' -exec cat {} \;

	- uses: actions/upload-artifact@v4
	if: failure()
	with:
	name: R-CMD-check-results
	path: treescanr.Rcheck