chore(workflow executor): config to run mutliple instances

[nbouliol]

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Security

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Note

Add Docker and nginx config to run multiple workflow-executor instances

• Adds a Dockerfile that builds the workflow-executor from the monorepo and starts the CLI on port 3400.
• Adds a docker-compose stack that runs two executor instances behind an nginx gateway on host port 3400, sharing a common Postgres run store.
• nginx uses round-robin load balancing with 600s proxy timeouts and automatic retry on 502/503/504 responses.
• Adds an env template with required variables for the compose stack and a corresponding executor:docker npm script in the example package.

^{Macroscope summarized d9e7d8f.}

[qltysh]

All good ✅

[qltysh]

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