core/busybox: create /tmp dir
the --initdb will be ignored if there are a /var/lib/apk/world file and will not create the needed /tmp. Since the apkovl contains this file, the /tmp will never be created, which causes busybox.post-install to fail due to the missing /tmp. The /tmp is provided by alpine-baselayout which depends on busybox so its not there whel busybox is installed. As a workaround we add /tmp to busybox package. The correct way to handle this is to make apk add create /tmp if its not there already when extracting the install script.
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