add rc version to CI

[ccoVeille]

The CI is using stable/oldstable

This component could be used

https://github.com/marketplace/actions/go-version-action

[ccoVeille]

For anyone interested, I have set it up on an open-source project pretty easily

https://github.com/goforj/godump/pull/43/files#diff-0ff6bcc45c7c09bfcb5419c83559f190add597ec3b82ad238ddb1d6e43e9517e