fix: actually include sensor firmware version string in repo, /version response

lib/localiser/domain/schema/sensor.ex

@@ -8,6 +8,7 @@ defmodule Localiser.Domain.Schema.Sensor do
   schema "sensors" do
     field :sensor_id, :string
     field :confirmed, :boolean, default: false
+    field :firmware_version, :string
     field :x, :float
     field :y, :float
     field :floor_x, :float, virtual: true
@@ -22,7 +23,7 @@ defmodule Localiser.Domain.Schema.Sensor do
   @doc false
   def changeset(sensor, attrs) do
     sensor
-    |> cast(attrs, [:sensor_id, :confirmed, :room_id, :x, :y])
+    |> cast(attrs, [:sensor_id, :confirmed, :firmware_version, :room_id, :x, :y])
     |> validate_required([:sensor_id])
     |> unique_constraint(:sensor_id)
     |> assoc_constraint(:room)