doc: update container documentation a bit #63

Job	Run time
container (curios-ntpd) / build (arm64)	5m 42s
container (curios-ntpd) / build (amd64)	5m 12s
container (curios-nftables) / build (arm64)	5m 14s
container (curios-httpd) / build (arm64)	4m 17s
container (curios) / build (amd64)	9m 0s
container (curios-nftables) / build (amd64)	5m 1s
container (curios-httpd) / build (amd64)	4m 41s
container (curios) / build (arm64)	9m 13s
container (curios-httpd) / push	15s
container (curios-nftables) / push	23s
container (curios-ntpd) / push	25s
container (curios) / push	0s
	49m 23s

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