chore(docker-env2): seed shared MxGateway data connection on site-x

Mirror docker/seed-sites.sh: create the MxGateway connection (10.100.0.48:5120)
on the env2 site and deploy artifacts so the DCL establishes it.

docker-env2/seed-sites.sh

@@ -39,6 +39,30 @@ $CLI $URL $AUTH notification create \
     --emails "engineer@company.com" \
 || echo "  (Engineering Alerts may already exist)"
 
+echo ""
+echo "Creating MxGateway data connection (shared gateway) on site-x..."
+# Shared MxGateway data connection pointing at the MxAccess Gateway. Data
+# connections are site-scoped (the DCL runs on site clusters only), so it is
+# created on the env2 site. Config is the typed MxGatewayEndpointConfig JSON
+# (camelCase keys), matching MxGatewayEndpointConfigSerializer.
+MXGW_ENDPOINT="http://10.100.0.48:5120"
+MXGW_APIKEY="mxgw_scadabridgeshared_O193yRm28zftUAcL-HPkTjAuE-vPz86MUtNLFWpcbOY"
+MXGW_CONFIG="{\"endpoint\":\"${MXGW_ENDPOINT}\",\"apiKey\":\"${MXGW_APIKEY}\",\"clientName\":\"\",\"writeUserId\":0,\"useTls\":false,\"caFile\":\"\",\"serverName\":\"\",\"readTimeoutMs\":5000}"
+
+SITE_X_ID=$($CLI $URL $AUTH --format json site list \
+    | python3 -c "import sys,json; print(next((s['id'] for s in json.load(sys.stdin) if s.get('siteIdentifier')=='site-x'), ''))" 2>/dev/null)
+if [ -n "$SITE_X_ID" ]; then
+    echo "  site-x (id=$SITE_X_ID): creating 'MxGateway Shared'..."
+    $CLI $URL $AUTH data-connection create \
+        --site-id "$SITE_X_ID" \
+        --name "MxGateway Shared" \
+        --protocol "MxGateway" \
+        --primary-config "$MXGW_CONFIG" \
+    || echo "    (MxGateway connection may already exist on site-x)"
+else
+    echo "  (site-x not found — skipping MxGateway connection)"
+fi
+
 echo ""
 echo "Seeding LDAP group mappings (Design + Deployment)..."
 # SecurityConfiguration.HasData declares 4 mappings but the InitialSchema
@@ -58,9 +82,17 @@ IF NOT EXISTS (SELECT 1 FROM LdapGroupMappings WHERE Id = 4)
 SET IDENTITY_INSERT LdapGroupMappings OFF;
 "
 
+echo ""
+echo "Deploying artifacts to all env2 sites (pushes the data connection so the"
+echo "site establishes it — the MxGateway DataConnectionActor connects eagerly)..."
+$CLI $URL $AUTH deploy artifacts \
+|| echo "  (artifact deploy reported an issue — check 'deploy status')"
+
 echo ""
 echo "=== Env2 site seeding complete ==="
 echo ""
 echo "Verify with: $CLI $URL $AUTH site list"
+echo "Verify connections: $CLI $URL $AUTH data-connection list"
+echo "Verify MxGateway is live: docker logs scadabridge-env2-site-x-a 2>&1 | grep -i mxgateway"
 echo "Multi-role test user now has Admin + Design + Deployment in env2."
 echo "Sign out and back in to refresh session role claims."