Embed types-dnscontrol.d.ts into the binary instead of fetching it via HTTP (#1942)

Co-authored-by: Tom Limoncelli <tlimoncelli@stackoverflow.com>

commands/writeTypes.go

@@ -1,10 +1,8 @@
 package commands
 
 import (
-	"io"
-	"net/http"
+	_ "embed"
 	"os"
-	"strings"
 
 	versionInfo "github.com/StackExchange/dnscontrol/v3/pkg/version"
 	"github.com/urfave/cli/v2"
@@ -39,17 +37,10 @@ func (args *TypesArgs) flags() []cli.Flag {
 	return flags
 }
 
+//go:embed types/dnscontrol.d.ts
+var dtsContent string
+
 func WriteTypes(args TypesArgs) error {
-	url := "https://raw.githubusercontent.com/StackExchange/dnscontrol/" + strings.Replace(versionInfo.SHA, "[dirty]", "", 1) + "/types/dnscontrol.d.ts"
-	print("Downloading " + url + " to " + args.DTSFile + "...")
-	defer print("\n")
-
-	resp, err := http.Get(url)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-
 	file, err := os.Create(args.DTSFile)
 	if err != nil {
 		return err
@@ -59,12 +50,11 @@ func WriteTypes(args TypesArgs) error {
 	file.WriteString("// This file was automatically generated by DNSControl. Do not edit it directly.\n")
 	file.WriteString("// To update it, run `dnscontrol write-types`.\n\n")
 	file.WriteString("// DNSControl version: " + versionInfo.Banner() + "\n")
-	file.WriteString("// Source: " + url + "\n\n")
-	_, err = io.Copy(file, resp.Body)
+	file.WriteString(dtsContent)
 	if err != nil {
 		return err
 	}
 
-	print(" done.")
+	print("Successfully wrote " + args.DTSFile + "\n")
 	return nil
 }