Trim leading and trailing space from volumes mount points

[andymarden]

Is your feature request related to a problem? Please describe

Kept getting a message when installing apprise-api on their UI hat the attachments dir (bind mounted) could not be read so went round the houses finding out why. Turns out there was a trailing space in the container mount point

Describe the solution you'd like

Trim leading and trailing spaces. Or issue a popup saying that there are these spaces and is that OK.

No-one in their right mind is going to create a dir with a leading or trailing space let's face it.

Describe alternatives you've considered

Well obvs I fixed it when I realised by coning into the container and seeing that dir it had created but it took a while to realise this is what was going on.

Additional context

No response