server/README.md: Clarify Docker build context (#398)

Previously, #386 proposed narrowing the scope of the build context for
'server/Dockerfile' to '/server'. As a consequence, `/sdk`, which is
required to build the server, would no longer be accessible. Locally,
this would necessitate explicitly referencing `/sdk` as a second
build context. When using the GitHub URL of this repository as build
context instead of a local repository, this would additionally lead to
inefficient data handling. Since Docker Compose does not yet support
sparse checkouts, specifying subdirectories like `/server` as build
context still results in the full repository being cloned. Consequently,
although `/sdk` would be downloaded, it would be excluded from the
narrowed build context and thus remain unavailable. Any attempt to
include `/sdk` separately afterwards would result in the same data being
downloaded again. As this is an inefficient solution, #386 is rejected.

This documents the decision of keeping the repository root as the build
context of `server/Dockerfile`. A corresponding note was added in
`server/README.md`.

Additionally, a mention of faulty line endings being a common error when
building the Docker container has been added in `server/README.md`.

Fixes #386

Author: moritzsommer

server/README.md

@@ -18,6 +18,8 @@ The container image can be built via:
 $ docker build -t basyx-python-server -f Dockerfile ..
 ```
 
+Note that when cloning this repository on Windows, Git may convert the line separators to CRLF. This breaks `entrypoint.sh` and `stop-supervisor.sh`. Ensure both files use LF line separators before building. 
+
 ## Running
 
 ### Storage
@@ -77,12 +79,13 @@ services:
     - "8080:80"
     volumes:
       - ./storage:/storage
-
 ````
 
 Here files are read from `/storage` and the server can be accessed at http://localhost:8080/api/v3.0/ from your host system. 
 To get a different setup this compose.yaml file can be adapted and expanded.
 
+Note that the `Dockerfile` has to be specified explicitly, as the build context must be set to the parent directory of `/server` to allow access to the local `/sdk`.
+
 ## Acknowledgments
 
 This Dockerfile is inspired by the [tiangolo/uwsgi-nginx-docker][10] repository.