add build instructions #26

Job	Run time
coverage - measure	2m 1s
sanitizer - debian:bookworm	2m 6s
linux - debian:bullseye	2m 31s
sanitizer - arm32v7/debian:bookworm	13m 59s
linux - arm32v7/debian:bullseye	14m 33s
sanitizer - arm64v8/debian:bookworm	3m 38s
linux - arm64v8/debian:bullseye	3m 26s
linux - debian:bookworm	2m 13s
linux - arm32v7/debian:bookworm	12m 44s
linux - arm64v8/debian:bookworm	2m 55s
linux - ubuntu:jammy	2m 1s
linux - igagis/raspbian:bullseye	10m 2s
linux - igagis/raspbian:bookworm	10m 20s
	1h 22m 29s

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