Docker compose example

[jmcdice]

This PR improves upon #1379

• Introduced variable OLLAMA_PORT for flexible port mapping.
• Modified health check to explicitly return exit code on failure.
• Extended health check interval to 10s for reduced load.
• Explicitly defined build context and Dockerfile path for clarity.

Add README markdown with build and run instructions.

[rick-github]

Just as a followup, the test only checks that the ollama server is responding to connections. In my own case, and this is likely overkill for most people, I check that the server responds to request, something like:

    test: ["CMD-SHELL", "/bin/bash -c '[[ $$(exec 3<> /dev/tcp/localhost/${OLLAMA_PORT:-11434} ; (echo GET / HTTP/1.0 ; echo) >&3 ; cat <&3) == *\"Ollama is running\" ]] || exit 1'"]