Docker compose "context", supported in Railway when building a Dockerfile?

Question

I have a Docker compose file I'm trying to bring to Railway, I'm noticing that one Dockerfile fails to build because it can't find the folders its trying to build:

```
#13 [10/17] COPY manage.py manage.py

#13 ERROR: failed to calculate checksum of ref 7949f621-c09b-43d4-a8c8-8e51ccffaaac::rcdz9vmeslipnvma2a9t0mwhm: "/manage.py": not found

#14 [11/17] COPY plane plane/

#14 ERROR: failed to calculate checksum of ref 7949f621-c09b-43d4-a8c8-8e51ccffaaac::rcdz9vmeslipnvma2a9t0mwhm: "/plane": not found

#15 [12/17] COPY templates templates/

#15 ERROR: failed to calculate checksum of ref 7949f621-c09b-43d4-a8c8-8e51ccffaaac::rcdz9vmeslipnvma2a9t0mwhm: "/templates": not found
```

The only difference I see to the other Dockerfiles in the compose file is it uses a context:

```
  api:
    container_name: api
    build:
      context: ./apiserver
      dockerfile: Dockerfile.api
```

My Dockerfile is built using:

```
RAILWAY_DOCKERFILE_PATH=./apiserver/Dockerfile.api
```