An unnecessary warning is raised when running charmcraft pack
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Issue body
### Bug Description
When following the charmcraft Flask tutorial (or any of the 12-Factor tutorials) https://canonical-charmcraft.readthedocs-hosted.com/en/latest/tutorial/kubernetes-charm-flask/, during the `charmcraft pack`, Charmcraft raises:
`WARNING: Cannot get a keyring. Every store interactions that requires authentication will require you to log in again.`
This caused confusion with users because they hadn't logged in and weren't sure whether this was an issue they needed to be concerned about
### To Reproduce
As above
### Environment
As per tutorial
### charmcraft.yaml
```yaml
As per tutorial
```
### Relevant log output
```shell
As above
```
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