add micropub channel setting

lib/chiya/site/setting.ex

@@ -15,6 +15,7 @@ defmodule Chiya.Site.Setting do
 
     belongs_to :home_channel, Chiya.Channels.Channel
     belongs_to :default_channel, Chiya.Channels.Channel
+    belongs_to :micropub_channel, Chiya.Channels.Channel
 
     timestamps()
   end

lib/chiya_web/controllers/setting_html/setting_form.html.heex

@@ -14,7 +14,17 @@
   <.input field={f[:user_agent]} type="text" label="User agent" />
   <.input field={f[:custom_css]} type="textarea" label="Custom css" class="font-mono" />
   <.input field={f[:custom_html]} type="textarea" label="Custom html" class="font-mono" />
-  <.input field={f[:home_channel_id]} type="select" label="Home Channel" options={@channels} />
+  <.input 
+    field={f[:home_channel_id]} 
+    type="select"
+    label="Home Channel"
+    options={@channels}
+  />
+  <.input 
+    field={f[:micropub_channel_id]} 
+    type="select" 
+    label="Micropub Channel" options={@channels} 
+  />
   <.input
     field={f[:default_channel_id]}
     type="select"

priv/repo/migrations/20230611183608_add_default_micropub_channel_setting.exs

@@ -0,0 +1,9 @@
+defmodule Chiya.Repo.Migrations.AddDefaultMicropubChannelSetting do
+  use Ecto.Migration
+
+  def change do
+    alter table(:settings) do
+      add :micropub_channel_id, references(:channels, on_delete: :nothing)
+    end
+  end
+end