Dockerfiles for all the things

[vypxl]

We need Dockerfiles for every implementation, and for the client.

Each Dockerfile should build the server executable and the container should expose the server at port 8080.

Reference Dockerfile in the Java implementation.

For better comparability, please also make sure that all runner containers run on alpine:latest and preferably use static linking.

• [x] C
• [x] Crystal
• [x] Elixir
• [x] Java
• [x] Python
• [x] Ruby
• [x] Rust
• [x] Swift
• [x] Go
• [ ] Client

[TecTrixer]

@vypxl I added a Dockerfile for Rust, its in the following PR: #13 If it works for you please merge the PR and put the checkmark next to Rust :)