chore(workflow executor): config to run mutliple instances

[nbouliol]

Definition of Done

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• Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

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Note

Add Docker multi-instance setup for workflow-executor with nginx gateway

• Adds a Dockerfile for the workflow executor, building and serving the CLI on port 3400 with JSON logging.
• Adds a docker-compose stack running two executor instances sharing a database, fronted by an nginx gateway that round-robin load-balances on port 3400 with retry on 5xx failures.
• Adds an nginx config with 600s proxy timeouts and proxy_next_upstream for error/timeout/5xx recovery.
• Adds convenience scripts to packages/_example/package.json to build executor images and launch the full multi-instance stack via concurrently.

^{Macroscope summarized 6514215.}

[qltysh]

All good ✅

[qltysh]

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