feat: add attachments (#2091)

packages/prisma/schema.prisma

@@ -422,6 +422,8 @@ model Envelope {
 
   documentMetaId String       @unique
   documentMeta   DocumentMeta @relation(fields: [documentMetaId], references: [id])
+
+  envelopeAttachments EnvelopeAttachment[]
 }
 
 model EnvelopeItem {
@@ -508,6 +510,22 @@ model DocumentMeta {
   envelope Envelope?
 }
 
+/// @zod.import(["import { ZEnvelopeAttachmentTypeSchema } from '@documenso/lib/types/envelope-attachment';"])
+model EnvelopeAttachment {
+  id String @id @default(cuid())
+
+  type  String /// [EnvelopeAttachmentType] @zod.custom.use(ZEnvelopeAttachmentTypeSchema)
+  label String
+
+  data String
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  envelopeId String
+  envelope   Envelope @relation(fields: [envelopeId], references: [id], onDelete: Cascade)
+}
+
 enum ReadStatus {
   NOT_OPENED
   OPENED