add script to generate sign_sk

[ppca]

cd infra/scripts/generate_cipher_and_sign_keys cargo run

[github-actions[bot]]

Terraform Feature Environment Destroy (dev-654)

Terraform Initialization ⚙️success

Terraform Destroy success

Show Destroy Plan

``` No changes. No objects need to be destroyed. Either you have not created any objects yet or the existing objects were already deleted outside of Terraform. Destroy complete! Resources: 0 destroyed. ```

Pusher: @ppca, Action: pull_request, Working Directory: `, Workflow:Terraform Feature Env (Destroy)`