Handle file mounting

[Phillezi]

Description

Mounting files as volumes works in Docker Compose, but this feature is not supported on kthcloud. To address this, we need to implement a workaround that checks if the volume's host path is a file and then creates a wrapping directory that contains only that file.

Proposed Solution

1. Check if the volume's host path is a file.
2. Create a wrapping directory that includes only the file.
3. Upload the wrapping directory to the storage server under the project's directory.
4. Ensure that the file is named on the deployment side based on the mount configuration (e.g., thisfilename.txt:otherfilename.otherext makes the file accessible as otherfilename.otherext).