Adjust Dockerfile to pre install dbt deps

[tatiana]

Introduce packages.yml into the project and run dbt deps from the Dockerfile in the astro-cli, disabling it in Cosmos render and execution steps.

This approach should also work when deploying using --dags.

Follows up on a discussion with @ReadytoRocc

[phanikumv]

This is a high priority ticket as discussed with @tatiana in the sprint call