Use GITHUB_TOKEN to access GitHub and avoid access limit

Attempt to get GITHUB_TOKEN from environment variables

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"net/http"
 	"os"
 
 	"github.com/google/go-github/v60/github"
@@ -11,6 +12,17 @@ var (
 	gitHub *github.Client
 )
 
+// TokenTransport implements http.RoundTripper for Bearer token authentication
+type TokenTransport struct {
+	Token     string
+	Transport http.RoundTripper
+}
+
+func (t *TokenTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	req.Header.Add("Authorization", "Bearer "+t.Token)
+	return t.Transport.RoundTrip(req)
+}
+
 func printHelp() {
 	helpText := `go2spec - A tool to package Go modules into RPM spec files.
 
@@ -29,13 +41,28 @@ If there are no commands provided, the tool will default to executing the 'pack'
 }
 
 func main() {
-	transport := github.BasicAuthTransport{
-		Username:  os.Getenv("GITHUB_USERNAME"),
-		Password:  os.Getenv("GITHUB_PASSWORD"),
-		OTP:       os.Getenv("GITHUB_OTP"),
-		Transport: httpcache.NewMemoryCacheTransport(),
+	token := os.Getenv("GITHUB_TOKEN")
+
+	var client *http.Client
+	if token != "" {
+		// Use token authentication for better rate limits
+		client = &http.Client{
+			Transport: &TokenTransport{
+				Token:     token,
+				Transport: httpcache.NewMemoryCacheTransport(),
+			},
+		}
+	} else {
+		// Fallback to basic auth if token is not provided
+		transport := github.BasicAuthTransport{
+			Username:  os.Getenv("GITHUB_USERNAME"),
+			Password:  os.Getenv("GITHUB_PASSWORD"),
+			OTP:       os.Getenv("GITHUB_OTP"),
+			Transport: httpcache.NewMemoryCacheTransport(),
+		}
+		client = transport.Client()
 	}
-	gitHub = github.NewClient(transport.Client())
+	gitHub = github.NewClient(client)
 
 	args := os.Args[1:]