Taking long to boot in heroku with Caveman projects

[rajasegar]

I am using this buildpack
https://github.com/gos-k/heroku-buildpack-roswell
for my project
https://github.com/rajasegar/cl-warehouse
It is based on Caveman, but it always fail with

; Loading "cl-warehouse"
2021-07-24T06:55:04.283588+00:00 app[web.1]: ..................................................
2021-07-24T06:55:04.314169+00:00 app[web.1]: [package cl-warehouse.config].....................
2021-07-24T06:55:04.321759+00:00 app[web.1]: [package cl-warehouse.view].......................
2021-07-24T06:55:04.324769+00:00 app[web.1]: [package cl-warehouse.djula]......................
2021-07-24T06:55:04.338789+00:00 app[web.1]: [package cl-warehouse.db].........................
2021-07-24T06:55:04.352953+00:00 app[web.1]: [package cl-warehouse]............................
2021-07-24T06:56:23.308919+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 120 seconds of launch
2021-07-24T06:56:23.384084+00:00 heroku[web.1]: Stopping process with SIGKILL
2021-07-24T06:56:23.567292+00:00 app[web.1]: [package cl-warehouse.web]...
2021-07-24T06:56:23.569281+00:00 heroku[web.1]: Process exited with status 137
2021-07-24T06:56:23.645478+00:00 heroku[web.1]: State changed from starting to crashed