Fixes for generating data.json

- remove rke2/k3s keys so data only has required info for rke1
- decide kdm url based on the tag version

codegen/codegen_test.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"os"
+	"testing"
+
+	"github.com/rancher/rke/metadata"
+)
+
+func TestGetURL(t *testing.T) {
+	tests := []struct {
+		name        string
+		envVar      string
+		tag         string
+		expectedURL string
+	}{
+		{
+			name:        "No Metadata URL and TAG is release version",
+			envVar:      "",
+			tag:         "v1.0.0",
+			expectedURL: defaultReleaseURL,
+		},
+		{
+			name:        "No Metadata URL and TAG is pre-release version",
+			envVar:      "",
+			tag:         "v1.0.0-alpha",
+			expectedURL: defaultDevURL,
+		},
+		{
+			name:        "Metadata URL set",
+			envVar:      "https://example.com",
+			tag:         "v1.0.0",
+			expectedURL: "https://example.com",
+		},
+		{
+			name:        "Invalid TAG",
+			envVar:      "",
+			tag:         "invalid-tag",
+			expectedURL: defaultDevURL,
+		},
+		{
+			name:        "No TAG",
+			envVar:      "",
+			tag:         "",
+			expectedURL: defaultDevURL,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Set the environment variables
+			os.Setenv(metadata.RancherMetadataURLEnv, tt.envVar)
+			os.Setenv("TAG", tt.tag)
+			defer func() {
+				os.Unsetenv(metadata.RancherMetadataURLEnv)
+				os.Unsetenv("TAG")
+			}()
+
+			result := getURL()
+
+			if result != tt.expectedURL {
+				t.Errorf("expected %s, got %s", tt.expectedURL, result)
+			}
+		})
+	}
+}