docs: add comments to train file #308

	# Name of workflow
	name: "CI pytest"

	# Define trigger
	on: push

	# Cancel the workflow
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	# Job
	build-and-deploy:
	runs-on: ubuntu-latest
	# define task
	steps:
	# 1. get content
	- name: "Checkout"
	uses: actions/checkout@v4
	with:
	persist-credentials: false
	fetch-depth: 0
	# 2. cache poetry dependencies
	- name: Cache Poetry dependencies and .cache
	uses: actions/cache@v4
	with:
	path: \|
	~/.cache/pypoetry
	.cache
	key: ${{ runner.os }}-poetry-${{ hashFiles('poetry.lock') }}
	restore-keys: \|
	${{ runner.os }}-poetry-
	# 3. run pytest
	- name: "Run env"
	run: \|
	make env
	# 4. run pytest
	- name: "Run pytest"
	run: \|
	make ci-pytest
	# 5. run generate docs
	- name: "Test generate docs"
	run: \|
	make docs
	# 6. run linter
	- name: "Linter"
	run: \|
	make lint \|\| exit 1
	# 7. run Commit linter
	- name: "Commit linter"
	uses: wagoid/commitlint-github-action@v5 # https://github.com/wagoid/commitlint-github-action

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