feat(refacto): move everything in internal package

This allows to install katenary with `go install` and to clean up the
project folder.

internal/generator/extrafiles/notes.go

@@ -0,0 +1,31 @@
+package extrafiles
+
+import (
+	_ "embed"
+	"fmt"
+	"strings"
+)
+
+//go:embed notes.tpl
+var notesTemplate string
+
+// NotesFile returns the content of the note.txt file.
+func NotesFile(services []string) string {
+	// build a list of ingress URLs if there are any
+	ingresses := make([]string, len(services))
+	for i, service := range services {
+		condition := fmt.Sprintf(`{{- if and .Values.%[1]s.ingress .Values.%[1]s.ingress.enabled }}`, service)
+		line := fmt.Sprintf(`{{- $count = add1 $count -}}{{- $listOfURL = printf "%%s\n- http://%%s" $listOfURL (tpl .Values.%s.ingress.host .) -}}`, service)
+		ingresses[i] = fmt.Sprintf("%s\n%s\n{{- end }}", condition, line)
+	}
+
+	// inject the list of ingress URLs into the notes template
+	notes := strings.Split(notesTemplate, "\n")
+	for i, line := range notes {
+		if strings.Contains(line, "ingress_list") {
+			notes[i] = strings.Join(ingresses, "\n")
+		}
+	}
+
+	return strings.Join(notes, "\n")
+}