install: Add cleanup step #7536

Job	Run time
frontend-tests	2m 21s
python-tests	3m 28s
deploy-docker-images (bootstrap, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	3m 13s
deploy-docker-images (core, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	10m 59s
deploy-raspberry-image (blueos-ci, linux/arm/v7, bookworm, raspios_lite_armhf/images/raspios_lite...	43m 5s
deploy-raspberry-image (pi5-builder, linux/arm64/v8, bookworm, raspios_lite_arm64/images/raspios_...	17m 4s
deploy-raspberry-image (pi4-builder2, linux/arm/v7, bullseye, raspios_lite_armhf/images/raspios_l...	40m 24s
	2h 0m 34s

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