feat(tazjin/nixos): helper script for mounting GeeseFS

Can't be bothered to make something more automated for now.

Change-Id: Ie245af90c1a62a5988b97d16f86b6567e1ffafd0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9493
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

users/tazjin/chase-geese/default.nix

@@ -0,0 +1,13 @@
+# Helpers for mounting GeeseFS into the right place.
+{ depot, pkgs, ... }:
+
+pkgs.writeShellScriptBin "chase-geese" ''
+  set -ueo pipefail
+
+  echo "Fetching credentials ..."
+  eval $(pass show keys/tazjin-geesefs)
+
+  echo "Mounting the cloud ..."
+  mkdir -p ~/cloud
+  ${depot.third_party.geesefs}/bin/geesefs tazjins-files ~/cloud
+''

users/tazjin/nixos/modules/physical.nix

@@ -21,6 +21,7 @@ in
       # programs from the depot
       (with depot; [
         users.tazjin.screenLock
+        users.tazjin.chase-geese
         config.tazjin.emacs
         third_party.agenix.cli
         third_party.josh