Add to CHANGELOG, correct/add diagrams. Mermaid needs "o" hack. #250

	name: Unit tests

	on:
	push:
	workflow_dispatch:

	jobs:

	unit-tests:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	node-version: [18.x]

	name: Run unit tests
	steps:
	- name: Set name of artifact folder with date and UTC time
	# https://www.shell-tips.com/linux/how-to-format-date-and-time-in-linux-macos-and-bash/#how-to-format-a-date-in-bash
	run: \|
	echo "UNIT_TESTS_ARTIFACT_NAME=_alkiln-misc-$(date +'%Y-%m-%d at %Hh%Mm%Ss' -u)UTC" >> $GITHUB_ENV
	- uses: actions/checkout@v4
	- uses: actions/setup-node@v4
	with:
	node-version: ${{ matrix.node-version }}
	- run: npm install
	- run: npm run unit
	# Artifacts
	- name: upload unit tests artifacts folder
	uses: actions/upload-artifact@v3
	# This will upload even if a previous step has failed
	if: ${{ always() }}
	with:
	name: ${{ env.UNIT_TESTS_ARTIFACT_NAME }}
	path: ./_alkiln-*

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