Always download the model weights when pod starts

[kerthcet]

What happened:

Because of InftyAI/omnistore#12, we'll always download the model weights even we cached them in the host machine.

What you expected to happen:

When model weights downloaded, we should not reload again.

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
• LWS version:
• llmaz version (use git describe --tags --dirty --always):
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:

[kerthcet]

/milestone v0.1.0

[kerthcet]

Let's not cache the models to the host right now because it makes little sense.