Add 'all_subregisties' property for Registry class #22

	name: Test gaarf-exporter

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

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install tox pytest
	- name: Run unit tests
	run: \|
	cd gaarf_exporter
	tox
	- name: Run integration tests
	run: \|
	cd gaarf_exporter
	pip install -e .
	gaarf-exporter --expose-metrics-with-zero-values --iterations 1 --delay 0

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