epm play: add bastyon (eterbug #17772)

play.d/bastyon.sh

+#!/bin/sh
+
+PKGNAME=Bastyon
+SUPPORTEDARCHES="x86_64"
+VERSION="$2"
+DESCRIPTION="Bastyon is a decentralized, open-source social network and video sharing platform."
+URL="https://bastyon.com/applications"
+
+. $(dirname $0)/common.sh
+
+warn_version_is_not_supported
+
+PKGURL=$(eget --list --latest "https://github.com/pocketnetteam/pocketnet.gui/releases" "Bastyon.AppImage")
+
+install_pkgurl