headscale-bin: Add -bin ebuild

Based on the gentoo headscale one, but using the official amd64
binary, as a lame workaround for the "improved" 0.17+ NIX buildsystem.

Signed-off-by: Stefan Knoblich <stkn@bitplumber.de>

net-vpn/headscale-bin/files/headscale.confd

@@ -0,0 +1,8 @@
+HEADSCALE_USER=headscale
+HEADSCALE_GROUP=headscale
+
+# max number of open files (for floodfill)
+rc_ulimit="-n 4096"
+
+# Options to headscale
+HEADSCALE_OPTIONS="serve"