Support Uppercase mount attributes to be compliant with Docker Py

[D3vil0p3r]

Currently docker py uses Mount attributes that start with uppercase letter (ref. https://github.com/docker/docker-py/blob/03e43be6af9b21f9f966eb84ca46a159b664ccf4/docker/types/services.py#L253).

A docker mount example list variable is like:

mounts: [{'Target': '/.exegol/spawn.sh', 'Source': '/home/athena/Exegol/exegol/utils/imgsync/spawn.sh', 'Type': 'bind', 'ReadOnly': True}, {'Target': '/tmp/.X11-unix', 'Source': '/tmp/.X11-unix', 'Type': 'bind', 'ReadOnly': False}, {'Target': '/etc/localtime', 'Source': '/etc/localtime', 'Type': 'bind', 'ReadOnly': True}, {'Target': '/opt/my-resources', 'Source': '/home/athena/.exegol/my-resources', 'Type': 'bind', 'ReadOnly': False}, {'Target': '/opt/resources', 'Source': '/home/athena/Exegol/exegol-resources', 'Type': 'bind', 'ReadOnly': False}, {'Target': '/workspace', 'Source': '/home/athena/.exegol/workspaces/default', 'Type': 'bind', 'ReadOnly': False}]

Currently it does not work in podman py.

Some projects using containers would use both Docker and Podman and, to avoid complex code, it could be useful if Podman can manage mount attributes as both lowercase and first-letter uppercase.

A solution could be normalize mount item keys when podman py mount receive input entries as the example above.

[D3vil0p3r]

#487