Add Terraform policy examples for Weave GitOps Policy

[chanwit]

trafficstars

We have an example from the early design of a policy. Let's iterate on it.

apiVersion: pac.weave.works/v2beta1
kind: Policy
metadata:
  name: weave.policies.test-terraform
spec:
  id: weave.policies.test-terraform
  name: Test Terraform Policy
  enabled: true
  description: "test policy for terraform"
  how_to_solve: "test policy for terraform"
  category: weave.categories.access-control
  severity: high
  targets: {kinds: [Terraform]}
  provider: terraform
  code: |
    package magalix.advisor.test_terraform
    violation[result] {  
      value := input.review.object.status.tfplan.planned_values.outputs.hello_world.value
      not startswith(value, "hello")
      result = {
        "issue_detected": true,
        "msg": sprintf("value must start with [hello] but found: %s", [value]),   
      }
    }

========

User Story:

As a Kubernetes administrator, I'd like to have Terraform policy examples for Weave GitOps Policy, so that I can easily understand and implement desired policies for my infrastructure.

Acceptance Criteria:

• [ ] Update the existing Weave Policy example to follow best practices and include clear instructions.
• [ ] Documentation on how to use and customize the provided policy example.
• [ ] Sample Terraform configuration to demonstrate using the example policy.

[chanwit]

Related resources:

• https://github.com/weaveworks/weave-action

[lasomethingsomething]

@fire-ant You flagged this to me as P1-level priority. What kind of example do you expect to see, and why is it a P1 need?

[yitsushi]

Is this still relevant?