supports binary-format, only esp* supported for now

internal/firmware/firmware.go

@@ -0,0 +1,14 @@
+package firmware
+
+import (
+	"fmt"
+	"strings"
+)
+
+func MakeFirmwareImage(infile, outfile, format string) error {
+	fmt.Printf("Creating firmware image from %s to %s with format %s\n", infile, outfile, format)
+	if strings.HasPrefix(format, "esp") {
+		return makeESPFirmareImage(infile, outfile, format)
+	}
+	return fmt.Errorf("unsupported firmware format: %s", format)
+}