fix(ansible-api): install ssh client

[simonjcarr]

Summary

• install Alpine openssh-client in the ansible-api image so Ansible can execute SSH transport commands

Validation

• PYTHONPATH=apps/ansible-api python3 -m unittest discover -s apps/ansible-api/tests
• gitleaks detect --no-git --source . --redact --verbose

Notes

• Local Docker daemon was unavailable, so image-level validation is left to CI Docker image build.