Build conan package in GitHub Actions?

[garethsb]

It's been a complete pain getting the Conan package updated this time, due to Conan v2 migration, Conan Center Index rules and dependency recipe changes.

It would be good to have an early warning.

Perhaps a separate GitHub Actions workflow that builds the Conan recipe from CCI against current tip of master (and PRs!) using latest Conan and dependency recipes. https://github.com/pboettch/json-schema-validator/pull/220/files could provide implementation inspiration but I do think using the CCI recipe rather than a local one is probably the right way to go for this project.