Change pages deployments size to 8 bytes

It was causing pages deployments 2.4 GB to fail

changelogs/unreleased/294221-gitlab-pages-deployments-over-the-max-int-size-in-bytes-fail-to-up.yml

+---
+title: Change pages deployments size to bigint
+merge_request: 50262
+author:
+type: fixed

db/migrate/20201217111448_change_pages_deployment_size_to_bigint.rb

+# frozen_string_literal: true
+
+class ChangePagesDeploymentSizeToBigint < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    change_column_type_concurrently :pages_deployments, :size, :bigint
+  end
+
+  def down
+    undo_change_column_type_concurrently :pages_deployments, :size
+  end
+end

db/post_migrate/20201217112249_change_pages_deployment_size_to_bigint_cleanup.rb

+# frozen_string_literal: true
+
+class ChangePagesDeploymentSizeToBigintCleanup < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    cleanup_concurrent_column_type_change :pages_deployments, :size
+  end
+
+  def down
+    undo_cleanup_concurrent_column_type_change :pages_deployments, :size, :integer, limit: 4
+  end
+end

db/schema_migrations/20201217111448

+32330327aa8db01b5bc2c533af5387e77ad3dc0c34eacaac16a793df75634ce6
\ No newline at end of file

db/schema_migrations/20201217112249

+938aa97919e5a15143a72f33bebb27e501d5ef7cc53cf4e7debe9dee398b7255
\ No newline at end of file

db/structure.sql

@@ -14869,10 +14869,11 @@ CREATE TABLE pages_deployments (
     project_id bigint NOT NULL,
     ci_build_id bigint,
     file_store smallint NOT NULL,
-    size integer NOT NULL,
     file text NOT NULL,
     file_count integer NOT NULL,
     file_sha256 bytea NOT NULL,
+    size bigint,
+    CONSTRAINT check_5f9132a958 CHECK ((size IS NOT NULL)),
     CONSTRAINT check_f0fe8032dd CHECK ((char_length(file) <= 255))
 );