DEV: Set a limit for ApiKey#description (#21502)

app/models/api_key.rb

@@ -17,6 +17,8 @@ class ApiKey < ActiveRecord::Base
           where(key_hash: hashed)
         }
 
+  validates :description, length: { maximum: 255 }
+
   after_initialize :generate_key
 
   def generate_key

spec/models/api_key_spec.rb

@@ -6,6 +6,7 @@ RSpec.describe ApiKey do
 
   it { is_expected.to belong_to :user }
   it { is_expected.to belong_to :created_by }
+  it { is_expected.to validate_length_of(:description).is_at_most(255) }
 
   it "generates a key when saving" do
     api_key = ApiKey.new