Pre-alpha release of azure-chrootbuilder

no guarantees this is bug free, use at your own risk

Test build for PR 7332

v1.3.5-c8a60c77d

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v1.3.0 + new Azure features

Adding source from Shared Image Gallery and Bearer JWT certificate authentication.

Test version with PR7203 reverted

Merge pull request #6788 from hashicorp/bar_add_lock

BasicProgresssBar: protect add/NewProxyReader with a lock

Fix Azure interactive authentication issue

This pre-release contains master up till hashicorp#7276, which fixes the interactive authentication that broke in v1.3.4.