fix dodgy container spawning

Author: KodrAus

test/SeqCli.EndToEnd/Support/TestConfiguration.cs

@@ -32,7 +32,7 @@ public CaptiveProcess SpawnCliProcess(string command, string additionalArgs = nu
         return new CaptiveProcess("dotnet", $"{TestedBinary} {commandWithArgs}", environment, supplyInput: supplyInput);
     }
 
-    public CaptiveProcess SpawnServerProcess(string storagePath, out Func<string> getOutput)
+    public CaptiveProcess SpawnServerProcess(string storagePath)
     {
         if (storagePath == null) throw new ArgumentNullException(nameof(storagePath));
 
@@ -41,9 +41,9 @@ public CaptiveProcess SpawnServerProcess(string storagePath, out Func<string> ge
         {
             var containerName = Guid.NewGuid().ToString("n");
             const string containerRuntime = "docker";
-            return new CaptiveProcess(containerRuntime, $"run --name {containerName} -e ACCEPT_EULA=Y -p {_serverListenPort}:80 datalust/seq:{imageTag}", stopCommandFullExePath: containerRuntime, stopCommandArgs: $"rm -f {containerName}");
+            return new CaptiveProcess(containerRuntime, $"run --name {containerName} -d -e ACCEPT_EULA=Y -p {_serverListenPort}:80 datalust/seq:{imageTag}", stopCommandFullExePath: containerRuntime, stopCommandArgs: $"rm -f {containerName}");
         }
 
-        var proc = new CaptiveProcess("seq", commandWithArgs);
+        return new CaptiveProcess("seq", commandWithArgs);
     }
 }