Provide a Docker image blueprint for air-gapped environments

[masci]

Is your feature request related to a problem? Please describe.
It's common to run Haystack behind its rest_api within a container that doesn't have access to the Internet. In these situations the solution would be creating a custom Docker image that incorporates any resource that Haystack would normally download as it's needed like models.

This approach is fully supported by the new Docker images but users have to figure out by themselves how to do this.

Describe the solution you'd like
Provide a blueprint in form of a Dockerfile showing how you would build an image capable of running a pipeline without internet access.

Describe alternatives you've considered
We could provide a CLI tool that guides the user through the process but I think we should start smaller.

Additional context
/cc @ju-gu for visibility

[mayankjobanputra]

Two ways:

leave comment large docker image

1. Cache HF Model
2. Local model path - copy model inside, not mount -

How would I test? - Run the API using gunicorn, call the API through a python script?

cache_model - telemetry changes

add simpler pipeline - reader pipeline without elasticsearch

[masci]

@mayankjobanputra I remember you wanted to keep this issue open to track some unfinished work, is still the case?

[mayankjobanputra]

Yesss. We can talk about it whenever you have time. :)

[mayankjobanputra]

Fixed in this PR: deepset-ai/haystack-demos#18