Add getters factory for attachements (#4567)

* Add getter factory for attachements

* Override guard in test

* Add secret in env variables

* Return custom message on expiration

* Rename to signPayload

---------

Co-authored-by: Thomas Trompette <thomast@twenty.com>

packages/twenty-server/src/engine/integrations/environment/environment-variables.ts

@@ -129,6 +129,13 @@ export class EnvironmentVariables {
   @IsOptional()
   LOGIN_TOKEN_EXPIRES_IN: string = '15m';
 
+  @IsString()
+  FILE_TOKEN_SECRET: string;
+
+  @IsDuration()
+  @IsOptional()
+  FILE_TOKEN_EXPIRES_IN: string;
+
   // Auth
   @IsUrl({ require_tld: false })
   @IsOptional()