add documentation how to install server on ubuntu 20.04 and add server version stuff

MareSynchronosServer/MareSynchronosServer/.config/dotnet-tools.json

@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-ef": {
+      "version": "6.0.6",
+      "commands": [
+        "dotnet-ef"
+      ]
+    }
+  }
+}

MareSynchronosServer/MareSynchronosServer/Hubs/ConnectionHub.cs

@@ -1,4 +1,5 @@
 using System.Linq;
+using System.Runtime.ConstrainedExecution;
 using System.Security.Claims;
 using System.Threading.Tasks;
 using MareSynchronos.API;
@@ -10,11 +11,12 @@ namespace MareSynchronosServer.Hubs
 {
     public class ConnectionHub : BaseHub<ConnectionHub>
     {
+        private const int ServerVersion = 1;
         public ConnectionHub(MareDbContext mareDbContext, ILogger<ConnectionHub> logger) : base(mareDbContext, logger)
         {
         }
 
-        public async Task<LoggedInUserDto> Heartbeat()
+        public async Task<ConnectionDto> Heartbeat()
         {
             var userId = Context.User!.Claims.SingleOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value;
             
@@ -23,15 +25,16 @@ namespace MareSynchronosServer.Hubs
             {
                 Logger.LogInformation("Connection from " + userId);
                 var user = (await DbContext.Users.SingleAsync(u => u.UID == userId));
-                return new LoggedInUserDto
+                return new ConnectionDto
                 {
+                    ServerVersion = ServerVersion,
                     UID = userId,
                     IsModerator = user.IsModerator,
                     IsAdmin = user.IsAdmin
                 };
             }
 
-            return new LoggedInUserDto();
+            return new ConnectionDto();
         }
     }
 }

MareSynchronosServer/MareSynchronosServer/MareSynchronosServer.csproj

@@ -17,6 +17,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.Extensions.Hosting.Systemd" Version="6.0.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Version="6.0.0" />
   </ItemGroup>
 

MareSynchronosServer/MareSynchronosServer/Program.cs

@@ -1,10 +1,9 @@
 using System;
-using System.IO;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Hosting;
 using System.Linq;
-using System.Reflection;
 using MareSynchronosServer.Data;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 
@@ -20,7 +19,10 @@ namespace MareSynchronosServer
             {
                 var services = scope.ServiceProvider;
                 var context = services.GetRequiredService<MareDbContext>();
-                context.Database.EnsureCreated();
+                context.Database.Migrate();
+                context.SaveChanges();
+
+                // clean up residuals
                 var users = context.Users.Where(u => u.CharacterIdentification != null);
                 foreach (var user in users)
                 {
@@ -37,6 +39,7 @@ namespace MareSynchronosServer
 
         public static IHostBuilder CreateHostBuilder(string[] args) =>
             Host.CreateDefaultBuilder(args)
+                .UseSystemd()
                 .UseConsoleLifetime()
                 .ConfigureWebHostDefaults(webBuilder =>
                 {