Fix GTFS_URL environment variable being ignored by docker-compose #126
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The hardcoded `GTFS_URL=value` syntax always set a literal value,
overriding any host environment variable. Switch to `${GTFS_URL:-default}`
interpolation so the host's GTFS_URL is used when set, falling back to
the Unitrans default otherwise. Fixes #120.
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The hardcoded
GTFS_URL=valuesyntax always set a literal value, overriding any host environment variable. Switch to${GTFS_URL:-default}interpolation so the host's GTFS_URL is used when set, falling back to the Unitrans default otherwise.Fixes #120.