Add first draft of optional metrics, updated docs #24

	---
	name: "Build image"

	on:
	workflow_dispatch:
	push:
	branches:
	- "main"

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build image and push to GitHub Container Registry
	uses: docker/build-push-action@v2
	with:
	context: .
	push: true
	tags: \|
	ghcr.io/mlibrary/bag-courier:latest
	ghcr.io/mlibrary/bag-courier:${{ github.sha }}
	file: ./Dockerfile

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