[labels] No command-line access to secrets by label

You're right, it looks like there's no way to query by label at the moment. However, it looks like you can view all secret details, including the (owner) label, by using "juju secrets --format=yaml". This lists all secrets, but will show a "label:" field for those that have an owner label. Would this work for you?

I'm still thinking that --especially given the siginificance that we are giving to the usage of labels-- there should be a lot more explicit/intuitive way to access secrets by the "primary" (i.e. owner's) label.

Once we're encouraged to rely on this single piece of information in our charms as an identifier -- would be a lot more elegant to have better-established means of command-line access than 'grep'-ing.

Based on the continued discussion (https://chat.charmhub.io/charmhub/pl/jddb4wtoepd1pk8f1uguykjyor) it seems like I'm not the only one who thinks there may be value in a dedicated direct access...