exp-20210306.4

Changes:

• c62600c update with docker cleanup in release step
• d33bc64 add checkout step
• c4890f4 update ci build to move to ado agents from oryxlinux pool
• 5b6193e move validation and nightly build to ado-agents (#950)
• bc887d8 Move validation builds to official ado agents (#949)
• c10353e replace oryxlinux pool with official ubuntu build agents (#930)
• 005ac06 Support yarn 2 (#942)
• 6a3683f update default php composer to 2 (#946)

This list of changes was auto generated.