Frontend: compress most files to .gz #2923

Job	Run time
frontend-tests	2m 30s
python-tests	3m 39s
deploy-docker-images (bootstrap, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	3m 26s
deploy-docker-images (core, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	10m 0s
deploy-raspberry-image	0s
	19m 35s

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