OPA v1 removed ast.BuildAnnotationSet() from the v0 path

[jalseth]

I am working on migrating conftest to support OPA v1. The v1 release of OPA states that the v0 code will remain present to give people time to migrate without breaking builds. However, v1 seems to have removed the BuildAnnotationSet function from the ast package which is preventing me from doing a multi-stage migration.

Before: https://pkg.go.dev/github.com/open-policy-agent/opa@v0.70.0/ast
After: https://pkg.go.dev/github.com/open-policy-agent/opa@v1.0.0/ast

Broken build: https://github.com/open-policy-agent/conftest/actions/runs/13220399393/job/36904640082?pr=1050

cc @anderseknert

[anderseknert]

Looks like this was missed. Realistically the v0 implementation is simply going to point to the v1 one though (as does most of the v0 functions). So until this is fixed, pointing to the v1 implementation yourself is going to mean the same thing as having the v0 library do it.

[jalseth]

Thanks. I was hesitant to use the V1 path in case it had differences, but I did not look into it so I didn't realize it was just an alias.