feat: add post-install provisioning script 🛠️

Standalone script for completing provisioning after disko-install
(mounts installed system, clones dotfiles, installs SSH key, generates
hardware config). Run via curl for single-command provisioning.

scripts/post-install-provision.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+# Run after disko-install when LUKS is already open.
+# Usage: curl -fsSL https://raw.githubusercontent.com/DannyDannyDanny/dotfiles/main/scripts/post-install-provision.sh | sudo bash -s -- phantom-ship
+set -euo pipefail
+
+HOSTNAME="${1:-phantom-ship}"
+USB_DATA="/tmp/usb-data"
+REPO="https://github.com/DannyDannyDanny/dotfiles.git"
+
+echo "=== Post-install provisioning for ${HOSTNAME} ==="
+
+# Mount installed system (LUKS already open from disko-install)
+mount /dev/mapper/crypted /mnt
+mount /dev/disk/by-partlabel/disk-main-ESP /mnt/boot 2>/dev/null || true
+for d in dev proc sys; do mount --bind /$d /mnt/$d; done
+
+# Clone dotfiles
+if [[ ! -d /mnt/etc/dotfiles ]]; then
+  chroot /mnt nix run --extra-experimental-features "nix-command flakes" nixpkgs#git -- \
+    clone "$REPO" /etc/dotfiles
+  echo "[ok] dotfiles cloned"
+else
+  echo "[skip] dotfiles already present"
+fi
+
+# Install SSH key
+if [[ -f "$USB_DATA/authorized_keys" ]]; then
+  mkdir -p /mnt/home/danny/.ssh
+  cp "$USB_DATA/authorized_keys" /mnt/home/danny/.ssh/authorized_keys
+  chmod 700 /mnt/home/danny/.ssh
+  chmod 600 /mnt/home/danny/.ssh/authorized_keys
+  chroot /mnt chown -R danny:users /home/danny/.ssh
+  echo "[ok] SSH key installed"
+else
+  echo "[warn] no authorized_keys on USB — add SSH key manually after boot"
+fi
+
+# Generate hardware config
+nixos-generate-config --show-hardware-config --root /mnt \
+  > /mnt/etc/dotfiles/nixos/hosts/${HOSTNAME}-hardware.nix
+echo "[ok] hardware config saved to hosts/${HOSTNAME}-hardware.nix"
+
+# Copy hardware config to USB for committing from Mac
+mkdir -p "$USB_DATA"
+cp /mnt/etc/dotfiles/nixos/hosts/${HOSTNAME}-hardware.nix "$USB_DATA/"
+echo "[ok] hardware config also copied to USB ($USB_DATA/)"
+
+umount -R /mnt
+cryptsetup close crypted 2>/dev/null || true
+
+echo ""
+echo "=== Done! Remove USB and reboot. ==="
+echo "After unlocking LUKS, SSH in: ssh danny@${HOSTNAME}"
+echo "Then: cd /etc/dotfiles/nixos && sudo nixos-rebuild switch --flake .#${HOSTNAME}"
+echo "Commit ${HOSTNAME}-hardware.nix from the USB back to the repo."