adding fixes for linter

fixes issues with linter
pkg/buildkit/buildkit.go:127:19: string `true` has 6 occurrences, make it a constant (goconst)

pkg/buildkit/buildkit.go

@@ -126,19 +126,20 @@ type Client struct {
 func validateCompression(compression string, name string) map[string]string {
 	attrs := make(map[string]string)
 	attrs["name"] = name
+	const truth = "true"
 	switch compression {
 	case "estargz":
-		attrs["push"] = "true"
+		attrs["push"] = truth
 		attrs["compression"] = "estargz"
-		attrs["force-compression"] = "true"
-		attrs["oci-mediatypes"] = "true"
+		attrs["force-compression"] = truth
+		attrs["oci-mediatypes"] = truth
 	case "zstd":
 		attrs["compression"] = "zstd"
-		attrs["force-compression"] = "true"
-		attrs["push"] = "true"
+		attrs["force-compression"] = truth
+		attrs["push"] = truth
 	// default is gzip
 	default:
-		attrs["push"] = "true"
+		attrs["push"] = truth
 	}
 	return attrs
 }

pkg/cmd/controller/root.go

@@ -18,8 +18,10 @@ func NewCommand() *cobra.Command {
 		Use:   "hephaestus-controller",
 		Short: "OCI image build controller using buildkit",
 	}
-	cmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "hephaestus.yaml", "configuration file")
-	cmd.PersistentFlags().StringVarP(&config.CompressionMethod, "compression", "d", "gzip", "Compression method options: zstd,estargz")
+	cmd.PersistentFlags().StringVarP(&cfgFile, "config", "c",
+		"hephaestus.yaml", "configuration file")
+	cmd.PersistentFlags().StringVarP(&config.CompressionMethod,
+		"compression", "d", "gzip", "Compression method options: zstd,estargz")
 	cmd.AddCommand(
 		newStartCommand(),
 		newRunGCCommand(),