freeswitch container: fix config generator, add support for static xml configs

containers/freeswitch/dynamic-xmlconfig/autoload_configs/modules.conf.xml

@@ -1,6 +1,6 @@
 <configuration name="modules.conf" description="Modules">
   <modules>
     <load module="mod_console"/>
-    {{ $_, $module := range .Modules }}<load module="{{ $module }}" />{{ end }}
+    {{ range $_, $module := .Modules }}<load module="{{ $module }}" />{{ end }}
   </modules>
 </configuration>

containers/freeswitch/dynamic-xmlconfig/main.go

@@ -2,9 +2,13 @@ package main
 
 import (
 	"embed"
+	"errors"
 	"fmt"
+	"io"
+	"io/fs"
 	"net/url"
 	"os"
+	"path/filepath"
 	"text/template"
 
 	"github.com/kelseyhightower/envconfig"
@@ -17,6 +21,7 @@ type Options struct {
 	LogLevel      string   `envconfig:"LOG_LEVEL" default:"info"`
 	Gateway       Gateway  `envconfig:"GATEWAY"`
 	Modules       []string `envconfig:"MODULES" default:"mod_event_socket,mod_sofia,mod_db,mod_dialplan_xml,mod_g723_1,mod_g729,mod_amr,mod_b64,mod_opus,mod_av,mod_sndfile,mod_native_file,mod_png,mod_local_stream,mod_tone_stream,mod_lua,mod_say_en"`
+	StaticXMLDir  string   `envconfig:"STATIC_XML_DIR" default:"/config"`
 }
 
 type Gateway struct {
@@ -141,6 +146,48 @@ func main() {
 	}
 
 	fmt.Println("</section>")
+
+	staticConfigDirectories, err := os.ReadDir(options.StaticXMLDir)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return
+		}
+		panic(err)
+	}
+
+	for _, entry := range staticConfigDirectories {
+		if !entry.IsDir() {
+			continue
+		}
+		fmt.Printf("<section name=\"%s\">\n", entry.Name())
+
+		filepath.WalkDir(filepath.Join(options.StaticXMLDir, entry.Name()), func(path string, d fs.DirEntry, err error) error {
+			if d.IsDir() {
+				return nil
+			}
+
+			fmt.Printf("<!-- %s -->\n", path)
+			if err != nil {
+				fmt.Printf("<!-- ERROR: %v -->", err)
+				return err
+			}
+
+			f, err := os.Open(path)
+			if err != nil {
+				panic(err)
+			}
+			defer f.Close()
+
+			data, err := io.ReadAll(f)
+			if err != nil {
+				panic(err)
+			}
+			fmt.Println(string(data))
+
+			return nil
+		})
+		fmt.Println("</section>")
+	}
 }
 
 func (g *Gateway) Decode(value string) error {