Upgrade application to golang v1.19 to resolve security warning, application performance and compatibility.

Also, update / upgrade workflows versions.

Add test cases for missing long lat and invalid request body.

This should fail if the provided data is incorrect.

Add helm chart test in k8s-test job CI workflow, this should validate both YAML and HELM chart deployment.

Problem Statement:
The application returns 404 for GET and POST including /metrics endpoints since refactoring the code.

Solution:
Looking through the code it looks there is no handler provided in http.Server

Problem Statement:

Multiple requests can lead to rate limiting from the provider. This will have unintended consequences for other users.

Currently, the application lacks caching capabilities.

Proposed Solution:

The preferred and the most obvious solution is to add a caching layer such as Redis or something equivalent.

That however will require Redis server as a prerequisite to the run the application.

With that in mind, perhaps it might be better to:

1. Add in application cache
2. Add optional cache layer such as Redis or equivalent via environment variables

Option 1 is the most obvious and straightforward solution, with option 2 being a longterm preferred solution.