Brainstorming output for a sibling docker-env2/ tree that brings up a
minimal second cluster (2 central + 1 site x 2 nodes + Traefik) on the
same machine alongside the primary docker/ stack. Shares the existing
scadalink-net network and scadalink-mssql container but uses separate
logical databases (ScadaLinkConfig2 / ScadaLinkMachineData2) so the
Transport (#24) feature can be exercised end-to-end with real
cross-environment exports and imports.
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