abuild: change shebang to /bin/ash
This script uses variable expansion / pattern replacement, which is not defined in POSIX-sh. Also APKBUILDs are not required to be strictly POSIX-sh compatible. If someone run abuild on system with e.g. dash as /bin/sh, then it fails (and someone reported exactly that on IRC today). Therefore abuild should explicitly use /bin/ash in shebang and not /bin/sh.
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