Expose git version in 'pk;stats' and '/v1/meta'

PluralKit.Core/Services/BuildInfoService.cs

@@ -0,0 +1,24 @@
+using System.IO;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace PluralKit.Core
+{
+    public static class BuildInfoService
+    {
+        public static string Version { get; private set; }
+
+        public static async Task LoadVersion()
+        {
+            using (var stream = typeof(BuildInfoService).Assembly.GetManifestResourceStream("version"))
+            {
+                // if this happens, something broke
+                if (stream == null) Version = "(unknown version) ";
+                else using (var reader = new StreamReader(stream)) Version = await reader.ReadToEndAsync();
+            }
+
+            // cheap hack to remove newline
+            Version = Version.Remove(Version.Length - 1);
+        }
+    }
+}