Compare updated template evaluator (#4092)

src/Sdk/WorkflowParser/CollectionsExtensions.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+
+namespace GitHub.Actions.WorkflowParser
+{
+    internal static class CollectionsExtensions
+    {
+        /// <summary>
+        /// Adds all of the given values to this collection.
+        /// Can be used with dictionaries, which implement <see cref="ICollection{T}"/> and <see cref="IEnumerable{T}"/> where T is <see cref="KeyValuePair{TKey, TValue}"/>.
+        /// </summary>
+        public static TCollection AddRange<T, TCollection>(this TCollection collection, IEnumerable<T> values)
+            where TCollection : ICollection<T>
+        {
+            foreach (var value in values)
+            {
+                collection.Add(value);
+            }
+
+            return collection;
+        }
+    }
+}