CI Runners: Add token expiration field

This field stores the runner's token expiration time.

Changelog: added
Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/30942

db/migrate/20220111154950_add_token_expires_at_to_ci_runners.rb

+# frozen_string_literal: true
+
+class AddTokenExpiresAtToCiRunners < Gitlab::Database::Migration[1.0]
+  def change
+    add_column :ci_runners, :token_expires_at, :datetime_with_timezone
+  end
+end

db/migrate/20220111154951_add_index_to_ci_runners_token_expires_at.rb

+# frozen_string_literal: true
+
+class AddIndexToCiRunnersTokenExpiresAt < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :ci_runners, [:token_expires_at, :id], order: { token_expires_at: :asc, id: :desc }, name: 'index_ci_runners_on_token_expires_at_and_id_desc'
+    add_concurrent_index :ci_runners, [:token_expires_at, :id], order: { token_expires_at: :desc, id: :desc }, name: 'index_ci_runners_on_token_expires_at_desc_and_id_desc'
+  end
+
+  def down
+    remove_concurrent_index_by_name :ci_runners, 'index_ci_runners_on_token_expires_at_desc_and_id_desc'
+    remove_concurrent_index_by_name :ci_runners, 'index_ci_runners_on_token_expires_at_and_id_desc'
+  end
+end

db/schema_migrations/20220111154950

+4719c533acaac3234ac0e131c70be49d0f98642e29e7d2e31519cc6c372056bc
\ No newline at end of file

db/schema_migrations/20220111154951

+48d6eaa68912f702be2bd38609bea4fa807eab7131f7c5e2261416820df9836a
\ No newline at end of file

db/structure.sql

@@ -12184,6 +12184,7 @@ CREATE TABLE ci_runners (
     config jsonb DEFAULT '{}'::jsonb NOT NULL,
     executor_type smallint,
     maintainer_note text,
+    token_expires_at timestamp with time zone,
     CONSTRAINT check_56f5ea8804 CHECK ((char_length(maintainer_note) <= 255))
 );
 
@@ -25711,6 +25712,10 @@ CREATE INDEX index_ci_runners_on_token ON ci_runners USING btree (token);
 
 CREATE INDEX index_ci_runners_on_token_encrypted ON ci_runners USING btree (token_encrypted);
 
+CREATE INDEX index_ci_runners_on_token_expires_at_and_id_desc ON ci_runners USING btree (token_expires_at, id DESC);
+
+CREATE INDEX index_ci_runners_on_token_expires_at_desc_and_id_desc ON ci_runners USING btree (token_expires_at DESC, id DESC);
+
 CREATE UNIQUE INDEX index_ci_running_builds_on_build_id ON ci_running_builds USING btree (build_id);
 
 CREATE INDEX index_ci_running_builds_on_project_id ON ci_running_builds USING btree (project_id);