Wrap 0_license initializer in `ee` block

config/initializers/0_license.rb

-begin
-  public_key_file = File.read(Rails.root.join(".license_encryption_key.pub"))
-  public_key = OpenSSL::PKey::RSA.new(public_key_file)
-  Gitlab::License.encryption_key = public_key
-rescue
-  warn "WARNING: No valid license encryption key provided."
-end
+require_dependency 'lib/gitlab'
+
+Gitlab.ee do
+  begin
+    public_key_file = File.read(Rails.root.join(".license_encryption_key.pub"))
+    public_key = OpenSSL::PKey::RSA.new(public_key_file)
+    Gitlab::License.encryption_key = public_key
+  rescue
+    warn "WARNING: No valid license encryption key provided."
+  end
 
-# Needed to run migration
-if ActiveRecord::Base.connected? && ActiveRecord::Base.connection.data_source_exists?('licenses')
-  message = LicenseHelper.license_message(signed_in: true, is_admin: true, in_html: false)
-  if ::License.block_changes? && message.present?
-    warn "WARNING: #{message}"
+  # Needed to run migration
+  if ActiveRecord::Base.connected? && ActiveRecord::Base.connection.data_source_exists?('licenses')
+    message = LicenseHelper.license_message(signed_in: true, is_admin: true, in_html: false)
+    if ::License.block_changes? && message.present?
+      warn "WARNING: #{message}"
+    end
   end
 end