Configuration — Demo

Demo and dev-only variables set by the demo Compose profile — not required for any production profile.

Demo / dev only

Set by docker-compose.demo.yaml for the zero-config demo profile — not required for any production profile. Override only to tune the simulated deployment stream.

Var	Required	Default	Purpose
EMIT_INTERVAL_MS	no	8000	Interval (ms) between simulated deployment events from the demo driver / emulator.
EMIT_DELAY_MS	no	0	Startup delay (ms) before the demo driver begins emitting.
GITHUB_SIM_RATE_LIMIT	no	5000	Simulated GitHub hourly request quota the emulator advertises.

Other demo vars (WRITE_API_URL, FETCHER_URL, GITHUB_EMULATOR_URL, MOCK_URL, PORT, SEED_ON_STARTUP, SCENARIOS_DIR) are fixed internal wiring set by the overlay and are not meant to be overridden.

Demo-gateway image vars

The demo profile uses the deployment-dashboard-gateway-demo image instead of the production gateway. Two additional vars are specific to that image:

Var	Default (in image)	Set by demo overlay	Purpose
DNS_RESOLVER	auto-detected from /etc/resolv.conf at container start (falls back to 127.0.0.11 if none found)	not set — auto-detect; override with 168.63.129.16 for Azure Container Apps if needed	DNS resolver for variable-based proxy_pass in the demo snippet — required because the demo-driver is an optional service.
DEMO_DRIVER_UPSTREAM	—	demo-driver:3001	Demo driver upstream host:port.

An explicit DNS_RESOLVER env always overrides auto-detection. These vars are absent from the production gateway image — its NGINX_ENVSUBST_FILTER excludes them.