Fix integration tests race condition.

Content.IntegrationTests/ContentIntegrationTest.cs

@@ -4,6 +4,7 @@ using Content.Client;
 using Content.Client.Interfaces.Parallax;
 using Content.Server;
 using Content.Server.Interfaces.GameTicking;
+using Content.Shared;
 using NUnit.Framework;
 using Robust.Server.Interfaces.Maps;
 using Robust.Server.Interfaces.Timing;
@@ -76,6 +77,9 @@ namespace Content.IntegrationTests
                 });
             };
 
+            // Avoid funny race conditions with the database.
+            options.CVarOverrides[CCVars.DatabaseSynchronous.Name] = "true";
+
             return base.StartServer(options);
         }
 

Content.Server/Database/ServerDbSqlite.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 using System.Net;
@@ -7,7 +6,10 @@ using System.Threading;
 using System.Threading.Tasks;
 using Content.Server.Preferences;
 using Content.Server.Utility;
+using Content.Shared;
 using Microsoft.EntityFrameworkCore;
+using Robust.Shared.Interfaces.Configuration;
+using Robust.Shared.IoC;
 using Robust.Shared.Network;
 
 #nullable enable
@@ -32,7 +34,15 @@ namespace Content.Server.Database
         {
             _prefsCtx = new SqliteServerDbContext(options);
 
-            _dbReadyTask = Task.Run(() => _prefsCtx.Database.Migrate());
+            if (IoCManager.Resolve<IConfigurationManager>().GetCVar(CCVars.DatabaseSynchronous))
+            {
+                _prefsCtx.Database.Migrate();
+                _dbReadyTask = Task.CompletedTask;
+            }
+            else
+            {
+                _dbReadyTask = Task.Run(() => _prefsCtx.Database.Migrate());
+            }
         }
 
         public override async Task<ServerBanDef?> GetServerBanAsync(IPAddress? address, NetUserId? userId)

Content.Shared/CCVars.cs

@@ -142,6 +142,10 @@ namespace Content.Shared
         public static readonly CVarDef<string> DatabasePgPassword =
             CVarDef.Create("database.pg_password", "", CVar.SERVERONLY);
 
+        // Basically only exists for integration tests to avoid race conditions.
+        public static readonly CVarDef<bool> DatabaseSynchronous =
+            CVarDef.Create("database.sync", false, CVar.SERVERONLY);
+
 
         /*
          * Outline