Complete archiso profile for OrionOS ISO build

- iso/profile/profiledef.sh: archiso profile with BIOS+UEFI bootmodes
- iso/profile/packages.x86_64: full package list (X11, audio, OrionOS deps)
- iso/profile/pacman.conf: pacman config for archiso
- iso/profile/airootfs/: live overlay (xinitrc, hostname, skel)
- iso/docker/Dockerfile: builds OrionOS from source, installs into airootfs, runs mkarchiso

iso/profile/airootfs/etc/hostname

@@ -0,0 +1 @@
+orionos

iso/profile/airootfs/etc/orionos/xinitrc

@@ -0,0 +1,9 @@
+#!/bin/bash
+# OrionOS live session autostart
+
+picom --config /etc/orionos/picom.conf &
+orionwallpaper &
+orionnotify &
+orionclip &
+oriondeskbar &
+exec orionwm

iso/profile/airootfs/etc/skel/.xinitrc

@@ -0,0 +1,2 @@
+#!/bin/bash
+source /etc/orionos/xinitrc

iso/profile/airootfs/root/.xinitrc

@@ -0,0 +1,2 @@
+#!/bin/bash
+source /etc/orionos/xinitrc