restrict travis builds to main and release branches (#11349)
restrict travis builds to main and release branches (#11349)


monetate/druid,nishantmonu51/druid,druid-io/druid,nishantmonu51/druid,monetate/druid,mghosh4/druid,druid-io/druid,mghosh4/druid,nishantmonu51/druid,druid-io/druid,monetate/druid,mghosh4/druid,mghosh4/druid,nishantmonu51/druid,druid-io/druid,nishantmonu51/druid,mghosh4/druid,nishantmonu51/druid,monetate/druid,monetate/druid,monetate/druid,druid-io/druid,monetate/druid,mghosh4/druid,nishantmonu51/druid,mghosh4/druid