chore: move checkout to composite action and use global ref #2

Job	Run time
set-matrix	3s
generate-swagger-ui (example_building_automation/api_docs/HotelFiware.yaml, example_building_auto...	7s
generate-swagger-ui (example_building_automation/api_docs/RadiatorThermostatFiware.yaml, example_...	6s
generate-swagger-ui (example_building_automation/api_docs/ActuatorFiware.yaml, example_building_a...	6s
generate-swagger-ui (example_building_automation/api_docs/HotelRoomFiware.yaml, example_building_...	7s
generate-swagger-ui (example_building_automation/api_docs/CoolingCoilFiware.yaml, example_buildin...	7s
generate-swagger-ui (example_building_automation/api_docs/CO2SensorFiware.yaml, example_building_...	8s
generate-swagger-ui (example_building_automation/api_docs/TemperatureSensorAmbFiware.yaml, exampl...	8s
generate-swagger-ui (example_building_automation/api_docs/SensorFiware.yaml, example_building_aut...	8s
generate-swagger-ui (example_building_automation/api_docs/TemperatureSensorFiware.yaml, example_b...	10s
generate-swagger-ui (example_building_automation/api_docs/FreshAirVentilationFiware.yaml, example...	8s
generate-swagger-ui (example_building_automation/api_docs/PresenceSensorFiware.yaml, example_buil...	6s
deploy-gh-pages	6s
	1m 30s

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