Package depot's gemma as a docker image for Cloud Run

Using <depot>'s gemma project with `dockerTools.buildLayeredImage` because I
need access to a nix-packaged server and gemma is the first thing that comes to
mind.

docker/config.lisp

@@ -0,0 +1,21 @@
+;; Example configuration file for Gemma
+
+(config :port 4242
+        :data-dir "/tmp/gemma/")
+
+(deftask bathroom/wipe-mirror 7)
+(deftask bathroom/wipe-counter 7)
+
+;; Bedroom tasks
+(deftask bedroom/change-sheets 7)
+(deftask bedroom/vacuum 10)
+
+;; Kitchen tasks
+(deftask kitchen/normal-trash 3)
+(deftask kitchen/green-trash 5)
+(deftask kitchen/blue-trash 5)
+(deftask kitchen/wipe-counters 3)
+(deftask kitchen/vacuum 5 "Kitchen has more crumbs and such!")
+
+;; Entire place
+(deftask clean-windows 60)