Add a map renderer (#3613)

Co-authored-by: github-actions <github-actions@users.noreply.github.com>

Content.MapRenderer/Extensions/EnvironmentExtensions.cs

@@ -0,0 +1,20 @@
+#nullable enable
+using System;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Content.MapRenderer.Extensions
+{
+    public static class EnvironmentExtensions
+    {
+        public static bool TryGetVariable(string key, [NotNullWhen(true)] out string? value)
+        {
+            return (value = Environment.GetEnvironmentVariable(key)) != null;
+        }
+
+        public static string GetVariableOrThrow(string key)
+        {
+            return Environment.GetEnvironmentVariable(key) ??
+                   throw new ArgumentException($"No environment variable found with key {key}");
+        }
+    }
+}