fix: [pages] Deploy pages only for the default branch

This means only published mofications will be served
5 jobs for branch/default in 3 minutes and 2 seconds (queued for 21 seconds)
Status Name Job ID Coverage
  Test
passed cubes_qa #50518

00:02:51

passed mr_center #50516

00:01:21

passed pipelines_status #50517

00:01:03

 
  Deploy
passed pages #50519

00:00:10

passed pages:deploy

00:00:00