Auto: opcuaclient-14 — ServerUriArray redundant failover

Closes #286

tests/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests/Docker/docker-compose.yml

@@ -44,6 +44,34 @@ services:
       retries: 10
       start_period: 10s
 
+  # opc-plc-secondary — second opc-plc instance for upstream-redundancy testing
+  # (PR-14, issue #286). Listens on a different port so it can run alongside the
+  # primary; the integration test suite drives a ServiceLevel drop on the primary
+  # and asserts the driver fails over onto the secondary's session. Both
+  # instances are independent — this isn't a real OPC UA redundant pair (there's
+  # no shared address space), but the failover-decision wiring is what we need
+  # to validate end-to-end.
+  opc-plc-secondary:
+    image: mcr.microsoft.com/iotedge/opc-plc:2.14.10
+    container_name: otopcua-opc-plc-secondary
+    restart: "no"
+    ports:
+      - "50002:50000"
+    command:
+      # Same flags as the primary so the test session-shape is identical. --pn
+      # stays at 50000 inside the container; the host-side port-map above puts
+      # it at 50002 for the test runner.
+      - "--pn=50000"
+      - "--ut"
+      - "--aa"
+      - "--alm"
+    healthcheck:
+      test: ["CMD-SHELL", "netstat -an | grep -q ':50000.*LISTEN' || exit 1"]
+      interval: 5s
+      timeout: 2s
+      retries: 10
+      start_period: 10s
+
   # opc-plc-rc — reverse-connect (server-initiated) variant. The simulator
   # acts as the OPC UA server but, unlike the regular service above, it dials
   # OUT to the client's listener URL instead of accepting an inbound dial.