docs: enhance README with comprehensive application documentation #453

	name: Docker

	on: [push, pull_request]

	env:
	ENVIRONMENT: test
	VERBOSE: true
	TERM: xterm

	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	DOCKER_REGISTRY: ghcr.io
	DOCKER_USERNAME: ${{ github.actor }}
	PROJECT: s3mart

	DOCKER_BUILD_BASE_IMAGES: true

	jobs:
	build-docker:
	name: Build and Push
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Show ref
	run: \|
	echo "Checking out $GITHUB_REF..."
	- name: Login to Registry
	run: \|
	echo $GITHUB_TOKEN \| docker login $DOCKER_REGISTRY -u $DOCKER_USERNAME --password-stdin
	- name: Pull latest image
	run: \|
	make docker-pull
	- name: Build Image
	run: \|
	make docker-build
	- name: Push Image
	run: \|
	make docker-push

	build-singularity:
	needs:
	- build-docker

	name: Build Singularity
	runs-on: ubuntu-latest

	container:
	image: quay.io/singularity/docker2singularity
	options: --privileged

	steps:
	- name: Login to Registry
	run: \|
	echo $GITHUB_TOKEN \| singularity remote login -u ${DOCKER_USERNAME} --password-stdin oras://${DOCKER_REGISTRY}
	- name: Build SIF File
	run: \|
	DOCKER_IMAGE="${DOCKER_REGISTRY}/${DOCKER_USERNAME}/${PROJECT}"
	SINGULARITY_IMAGE="$(echo -n ${DOCKER_IMAGE} \| tr -c '[:alnum:].' '-').sif"

	docker-entrypoint.sh /docker2singularity.sh \
	--name ${SINGULARITY_IMAGE} \
	${DOCKER_IMAGE}

	singularity push /output/${SINGULARITY_IMAGE} oras://${DOCKER_REGISTRY}/${DOCKER_USERNAME}/${PROJECT}:singularity

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