Implement silent password retrieval from fixtures.tfvars for SCP in az_connect_k8s.sh

[Copilot]

The az_connect_k8s.sh script prompted users for password during SCP operations and required manual SSH host key acceptance, breaking automation workflows.

Changes

• Auto-extract credentials: Parse admin_user and admin_password from fixtures.tfvars using grep/sed
• Silent SCP: Use sshpass with SSH options -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null
• Remove hardcoded user: Replace mhadmin with dynamically retrieved value from fixtures
• Fallback installation: Auto-install sshpass if missing

Before/After

# Before: prompts for password and host key
scp mhadmin@$master_pip:/home/mhadmin/.kube/config ~/.kube/config

# After: fully automated
sshpass -p "$admin_password" scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
    ${admin_user}@${master_pip}:/home/${admin_user}/.kube/config ~/.kube/config

The extraction logic handles varied spacing and special characters in passwords. Error handling validates file existence and successful parsing before proceeding.

Original prompt

Work on TODO: scp prompts for password - retrieve and use password from fixtures.tfvars silently (from 03-Azure/01-03-Infrastructure/03_Hybrid_Azure_Arc_Kubernetes/lab/scripts/az_connect_k8s.sh)

Created from VS Code via the GitHub Pull Request extension.

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