Part 2 build order: secure first, then the outage test

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Flow in eight steps: create a private CA with cert-manager; deploy the OPC UA simulator with secure endpoints; let Akri find the six servers; configure Telegraf to read the tags and publish MQTT; run EMQX with ACLs, a rule and a Pub/Sub sink; confirm the first message arrives in Pub/Sub; cut and restore the link to Google Cloud; pull the messages and verify there are no gaps and no reordering.