tiny alpine iso which boots straight to copyparty and r0c

the little brother of https://a.ocv.me/pub/stuff/edcd001/

* the `iso` can be written to a cd with [imgburn](https://www.imgburn.com/) or
  `wodim -dao speed=0 -v -data miniparty.iso`

* the `usb.xz` can be written to a flashdrive with [rufus](https://rufus.ie/en/) or [usbimager](https://bztsrc.gitlab.io/usbimager/) or
  `xz -dkc miniparty.usb.xz >/dev/sdm`

source code for building it yourself: https://github.com/9001/asm/tree/hovudstraum/p/miniparty/sm/how2build