Feature/serial command improvements #258

Job	Run time
build-captive-portal	53s
get-targets / generate-matrix	9s
build-firmware (Wemos-D1-Mini-ESP32)	1m 58s
build-firmware (Wemos-Lolin-S2-Mini)	2m 0s
build-firmware (Wemos-Lolin-S3)	2m 9s
build-firmware (Pishock-2023)	1m 48s
build-firmware (Pishock-Lite-2021)	2m 3s
build-firmware (Seeed-Xiao-ESP32S3)	2m 5s
build-filesystem	1m 6s
merge-images (Wemos-D1-Mini-ESP32)	32s
merge-images (Wemos-Lolin-S2-Mini)	24s
merge-images (Wemos-Lolin-S3)	29s
merge-images (Pishock-2023)	36s
merge-images (Pishock-Lite-2021)	39s
merge-images (Seeed-Xiao-ESP32S3)	29s
done	1s
	17m 21s

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