test

add env variable parsing for healthcheck command #93

Job	Run time
dependencies / arm64	6m 37s
dependencies / amd64 \| v1.7.28	6m 4s
in-host / windows	19m 16s
dependencies / amd64	5m 19s
in-host / windows (canary)	22m 15s
in-host / docker < linux	19m 5s
unit / ubuntu-24.04 (go canary)	7s
unit / ubuntu-24.04	2m 8s
unit / macos-15	1m 47s
unit / windows-2025	2m 40s
in-container / nerdctl.gomodjail < rootless	34m 0s
in-container / rootful (arm)	14m 17s
in-container / rootful (ipv6)	8m 34s
in-container / rootless	31m 14s
in-container / rootless (arm)	12m 55s
in-container / rootless (old ubuntu) (ctd: v1.7.28) (rlk: v1.1.1)	31m 2s
in-container / rootful	33m 53s
in-container / rootful (old ubuntu) (ctd: v1.7.28)	34m 52s
in-container / rootless-port-slirp4netns	13m 56s
in-container / rootful (canary)	33m 34s
	5h 33m 35s

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