Error while starting couchbase-server service: sh: 1: /opt/couchbase/init/init-cbserver.sh: not found

Hi @pietergreyling ! I cloned your project and I found one issue when trying to run the couchbase-server service.

I followed the instructions on README.md file and when I checked the container logs I found this error: couchbase-server | sh: 1: /opt/couchbase/init/init-cbserver.sh: not found.

To fix this, I added a reference to the script available on `./couchbase-server/init-cbserver.sh` pointing to `/opt/couchbase/init/init-cbserver.sh`:

```ymal
services:
couchbase-server:
...
volumes:
- ./couchbase-server/init-cbserver.sh:/opt/couchbase/init/init-cbserver.sh
```

With this change I was able to run it on my local.

Thanks!

Start with README.md and the couchbase-server service configuration, then inspect couchbase-server/init-cbserver.sh and the container logs reproduced by the documented Docker Compose command. Ensure the init script is available at /opt/couchbase/init/init-cbserver.sh when the service starts, and verify that couchbase-server runs successfully.

Written by the indexing model from the issue text.