Add granite template to llama.cpp

Author: arch-btw

src/llama.cpp

@@ -21713,7 +21713,17 @@ static int32_t llama_chat_apply_template_internal(
                 ss << message->content << "\n\n";
             }
         }
-    } else {
+    } else if (tmpl == "granite" || tmpl_contains("<|start_of_role|>")) {
+    // IBM Granite template
+    for (const auto& message : chat) {
+        std::string role(message->role);
+        ss << "<|start_of_role|>" << role << "<|end_of_role|>" << "\n"
+           << message->content << "<|end_of_text|>\n";
+    }
+    if (add_ass) {
+        ss << "<|start_of_role|>assistant<|end_of_role|>\n";
+    }
+} else {
         // template not supported
         return -1;
     }