Support Postgres with non-standard version string

(cherry picked from commit 40f4ef27b22113c1dae0d0cbdee8205132bed68a)

src/NzbDrone.Core/Datastore/DatabaseVersionParser.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Text.RegularExpressions;
+
+namespace NzbDrone.Core.Datastore;
+
+public static class DatabaseVersionParser
+{
+    private static readonly Regex VersionRegex = new (@"^[^ ]+", RegexOptions.Compiled);
+
+    public static Version ParseServerVersion(string serverVersion)
+    {
+        var match = VersionRegex.Match(serverVersion);
+
+        return match.Success ? new Version(match.Value) : null;
+    }
+}