Improve command handling #226

Job	Run time
build-captive-portal	56s
get-targets / generate-matrix	4s
build-firmware (Wemos-D1-Mini-ESP32)	1m 32s
build-firmware (Wemos-Lolin-S2-Mini)	2m 30s
build-firmware (Wemos-Lolin-S3)	2m 14s
build-firmware (Pishock-2023)	1m 35s
build-firmware (Pishock-Lite-2021)	2m 6s
build-firmware (Seeed-Xiao-ESP32S3)	2m 21s
build-filesystem	54s
merge-images (Wemos-D1-Mini-ESP32)	39s
merge-images (Wemos-Lolin-S2-Mini)	31s
merge-images (Wemos-Lolin-S3)	33s
merge-images (Pishock-2023)	41s
merge-images (Pishock-Lite-2021)	37s
merge-images (Seeed-Xiao-ESP32S3)	35s
done	2s
	17m 50s

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