close #183: support dash, ksh #428

Job	Run time
homebrew-macos-test	9m 50s
fresh-macos-test	9m 49s
login-shells-and-linting	9m 52s
distro-test (ubuntu:latest)	3m 40s
distro-test (fedora:latest)	4m 49s
distro-test (debian:latest)	3m 48s
distro-test (alpine:latest)	6m 43s
distro-test (manjarolinux/base)	3m 55s
distro-test (opensuse/leap)	7m 2s
distro-test (opensuse/tumbleweed)	3m 54s
distro-test (kalilinux/kali-rolling)	4m 28s
	1h 7m 50s

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