Switch azure default region to west us
Update find-image script to work with new API spec
Add version for every os image build
generate measurements: Use new API paths
CLI: config fetch measurements: Use image short versions to fetch measurements
CLI: allows shortnames to specify image in config
Image build pipeline: Change paths to contain "ref" and "stream"
Write images README with instructions on how to build constellation images locally
Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>