blog: handling promise versions and upgrades

[kirederik]

🥅 GOALS

• Promise authors learn what circumstances make rolling back a promise upgrade hard/impossible
• Promise authors understand how to better manage their CRDs and Workflows as to minimise those problems
• Promise authors learn how to deploy a promise with multiple crds [optional goal]

👽 AUDIENCE

• Promise writers

Done When

• Reviewed by someone else in the team
• Published

Resources

• We did a spike on what makes it hard to roll back kratix: https://github.com/syntasso/enterprise-kratix/issues/41; this blog should include those findings
• Write blog posts developers read
• The GACC Marketing Brief