Remove historic minergate trigger

This is only relevant for for GitLab.com.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/322110

changelogs/unreleased/ab-remove-minergate-trigger.yml

+---
+title: Remove historic minergate trigger (GitLab.com only)
+merge_request: 54910
+author:
+type: other

db/migrate/20210223105256_remove_minergate_trigger_on_git_lab_com.rb

+# frozen_string_literal: true
+
+class RemoveMinergateTriggerOnGitLabCom < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab.com?
+
+    with_lock_retries do
+      execute <<~SQL
+        DROP TRIGGER IF EXISTS ci_builds_block_minergate ON ci_builds;
+      SQL
+    end
+
+    execute <<~SQL
+      DROP FUNCTION IF EXISTS make_build_to_be_stuck_with_lock_version();
+      DROP FUNCTION IF EXISTS make_build_to_be_stuck();
+    SQL
+  end
+
+  def down
+    # no-op
+  end
+end

db/schema_migrations/20210223105256

+5fa0e89f9d7715309f6fd9808a07c34bcca0d556a2a4a2841f419b3279db8759
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