chore: add k8s 1.22 to no-egress validation actions (Azure#4690)

chore: update Ubuntu 18.04 VHD to 2021.09.27 (Azure#4683)

fix: always install GPU drivers during bootstrapping (Azure#4634)

release: SSH_AUTH_SOCK in CI so we can run E2E (Azure#4604)

release: create branch by pushing to origin remote (Azure#4576)

chore: Update Azure constants (Azure#4537)

Co-authored-by: jackfrancis <jackfrancis@users.noreply.github.com>

release: add local tag before running make dist (Azure#4509)

ci: don't run vmss-prototype tests for release (Azure#4458)

chore: rev 18.04-LTS VHD to 2021.05.24 (Azure#4438)

fix: vmas with ephemeral os should use aligned AS sku (Azure#4436)