Document the process of setting up a proxy environment to test CKF behind proxy

[NohaIhab]

Context

To run the UATs behind proxy, we need a way of setting up a proxy environment.
This is related to #755, but since we do not have cycles to spec it out and discuss the best approach, we need to document the manual way which we are doing it now.

What needs to get done

Create a document on how to:

1. setup a proxy environment
2. deploy CKF behind proxy

Definition of Done

document is created and reviewed

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6043.

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[NohaIhab]

Manual steps to setup a proxy env using AWS

1. From the AWS Console go to VPC, create VPC and choose the VPC and more option, then create a VPC and subnets

• 1 AZ
• 1 public subnet
• 1 private subnet
• None NAT gateway
• None VPC Endpoints

2. Create an AWS Instance in the Private Subnet -> this is the machine behind proxy where CKF will be deployed

• Configure the security group for the private instance to:
  • allow inbound HTTP connection on port 80 from the public instance IP
  • allow inbound SSH connection from the public instance IP

3. Create an AWS Instance in the Public Subnet -> this is where the proxy server will live

   • Cofigure the security group for the public instance to allow inbound connections on the proxy port from the private instance IP (with Custom TCP)

4. Setup the proxy server in the public machine - you can use squid

5. Setup Juju+Microk8s in the machine behind proxy by following our guide

[NohaIhab]

the above steps were refactored and written in more detail in the team's internal informational spec KF102