added build iso script back

build_iso.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+rm -fv *.iso
+
+if [[ "$1" == "" ]]; then
+    WORKDIR=$(mktemp -d)
+else
+    WORKDIR="$1"
+    if [[ ! -d "$WORKDIR" ]]; then
+        mkdir -p "$WORKDIR"
+    fi
+fi
+
+# idk if this would've happened automatically?
+cp crystal/pacman.conf crystal/airootfs/etc/.
+cp crystal/packages.x86_64 crystal/airootfs/etc/packages.x86_64
+cp /etc/pacman.d/mirrorlist crystal/airootfs/etc/pacman.d/.
+echo "Built on $(date +"%D @ %T EST")" > crystal/airootfs/etc/buildstamp
+time sudo ./mkarchiso -v -w $WORKDIR -o . crystal
+sudo rm -rf $WORKDIR