doc: update container documentation #341

Job	Run time
Build container / Build container	21s
Build slim container / Build container	18s
arm-linux-gnueabihf / Build depends	53s
x86_64-pc-linux-gnu_multiprocess / Build depends	1m 6s
x86_64-pc-linux-gnu / Build depends	53s
x86_64-pc-linux-gnu_nowallet / Build depends	1m 1s
x86_64-apple-darwin / Build depends	1m 6s
x86_64-w64-mingw32 / Build depends	1m 0s
arm-linux-build / Build source	3m 44s
linux64_fuzz-build / Build source	16m 53s
linux64_sqlite-build / Build source	6m 18s
linux64_ubsan-build / Build source	7m 0s
linux64-build / Build source	5m 56s
win64-build / Build source	10m 7s
linux64_nowallet-build / Build source	6m 16s
linux64_multiprocess-build / Build source	37m 6s
linux64_tsan-build / Build source	10m 56s
mac-build / Build source	3m 36s
linux64-test / Test source	34m 14s
linux64_sqlite-test / Test source	28m 19s
linux64_nowallet-test / Test source	13m 2s
linux64_ubsan-test / Test source	33m 52s
linux64_tsan-test / Test source	55m 3s
linux64_multiprocess-test / Test source	46m 41s
	5h 25m 41s

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