bug fix: fix mktemp on macos and escaping backslashes on alpine #219

Job	Run time
lint	7s
test (ubuntu-latest, ubuntu:latest, ubuntu)	35s
test (ubicloud, alpine:latest, alpine)	28s
test (ubicloud, rockylinux:9, rockylinux)	1m 24s
test (windows-latest, windows)	3m 5s
test (macos-latest, macos)	1m 29s
Test Makeself on NetBSD	1m 53s
Test Makeself on Nanoserver	32s
Test Makeself on Alpine	8s
Test Makeself on FreeBSD	2m 57s
Test Makeself on OpenBSD	2m 30s
Test Makeself on Solaris	4m 50s
	19m 58s

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