mklive.sh: ensure dash is /bin/sh if installed

mklive.sh

@@ -164,13 +164,21 @@ install_packages() {
     if [ -f "$ROOTFS"/etc/default/libc-locales ]; then
         sed -e "s/\#\(${LOCALE}.*\)/\1/g" -i "$ROOTFS"/etc/default/libc-locales
     fi
+
     if XBPS_ARCH=$BASE_ARCH "$XBPS_QUERY_CMD" -r "$ROOTFS" dkms >/dev/null 2>&1; then
         # dkms modules alphabetically before dkms can't configure
         # if dkms hasn't configured beforehand to create /var/lib/dkms
         chroot "$ROOTFS" env -i xbps-reconfigure dkms
     fi
+
     chroot "$ROOTFS" env -i xbps-reconfigure -a
 
+    if XBPS_ARCH=$BASE_ARCH "$XBPS_QUERY_CMD" -r "$ROOTFS" dash >/dev/null 2>&1; then
+        # bash configures alphabetically before dash,
+        # so if it's installed we should ensure it's /bin/sh
+        chroot "$ROOTFS" env -i xbps-alternatives -s dash
+    fi
+
     post_install_packages
 }