chore: Update Docker dev setup

spec/dummy/db/schema_development.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2018_06_07_053739) do
+ActiveRecord::Schema[8.0].define(version: 2018_06_07_053739) do
   create_table "active_admin_comments", force: :cascade do |t|
     t.string "namespace"
     t.text "body"