feat: basic Docker support

.dockerignore

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+# Distribution Files
+/Distribution/ModernUO
+/Distribution/ModernUO.*
+/Distribution/Server
+/Distribution/Server.*
+/Distribution/Assemblies
+/Distribution/bsdtar
+/Distribution/Configuration/antimacro.json
+/Distribution/Configuration/assistants.json
+/Distribution/Configuration/expansion.json
+/Distribution/Configuration/modernuo.json
+/Distribution/Configuration/email-settings.json
+/Distribution/Configuration/throttles.json
+/Distribution/Configuration/tot.json
+/Distribution/Logs
+/Distribution/Archives
+/Distribution/Backups
+/Distribution/Saves
+/Distribution/docs
+/Distribution/temp
+/Distribution/*.dylib
+/Distribution/*.so
+/Distribution/*.dll
+/Distribution/*.exe
+/Distribution/runtimes
+/Distribution/nohup.out
+/Distribution/ref
+/Distribution/web
+
+/Projects/*/obj
+/Projects/*/bin
+/Projects/*/Generated
+
+*.swp
+*.log
+*.user
+/.idea
+/.vs
+/.vscode
+
+.DS_Store
+
+/packages/*
+/Distribution/Configuration/server-access.json

DOCKER.md

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+## Getting Started
+
+Disclaimer: This document assumes familiarity with running containerized workloads.
+
+### Build
+
+```shell
+# linux/amd64
+docker build -t modernuo/modernuo .
+
+# linux/arm64
+docker build --build-arg ARCH=arm64 -t modernuo/modernuo .
+```
+
+Note: `docker buildx` is capable of building for `amd64` on `arm64` machines (and other combinations), but that beyond the scope of this document.
+
+### Run
+
+In order to run the image as a container you need to provide three volume mounts:
+1. Save files, or an empty directory in which to save the game server.
+1. Configuration files, or an empty directory in which to save the configurations.
+1. Data files, from the Data directory in the repository
+1. UO files.
+
+In the following example we make three assumptions:
+1. UO files are located on the host machine at the path `/some/UO/place`.
+1. The `dataDirectories` array in `Configuration/modernuo.json` includes `/bin/UO`.
+1. The `docker run` command is being executed in the root of the repository.
+
+```shell
+docker run \
+  --volume $(pwd)/Distribution/Configuration:/bin/modernuo/Configuration \
+  --volume $(pwd)/Distribution/Data:/bin/modernuo/Data \
+  --volume $(pwd)/Distribution/Saves:/bin/modernuo/Saves \
+  --volume /some/UO/place:/bin/UO \
+  --expose 2593 \
+  modernuo/modernuo:latest
+```
+
+#### Empty `Configuration` Directory
+
+If mounting an empty directory to the `Configuration` directory, use the following command instead.  This variation will allow user input.  This is required for initial configuration with an empty directory.  In subsequent runs the above command should suffice.
+
+```shell
+docker run \
+  -it \
+  --volume $(pwd)/Distribution/Configuration:/bin/modernuo/Configuration \
+  --volume $(pwd)/Distribution/Data:/bin/modernuo/Data \
+  --volume $(pwd)/Distribution/Saves:/bin/modernuo/Saves \
+  --volume /some/UO/place:/bin/UO \
+  --expose 2593 \
+  modernuo/modernuo:latest
+```
+Note: the volume is still required for the game data directory, the configuration affects the component that is `/bin/UO` in the example.
+
+### Connect
+
+Connect to the shard at `127.0.0.1:2593`.

Dockerfile

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+# syntax=docker.io/docker/dockerfile:1.7-labs
+ARG DOTNET_VERSION=9.0.101
+ARG OS=linux
+ARG ARCH=x64
+
+FROM ubuntu:24.10 AS dependencies
+ARG DOTNET_VERSION
+ARG ARCH
+ARG OS
+
+RUN apt-get update -y \
+    && apt-get install -y libicu-dev curl
+
+RUN curl -L https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh -o dotnet-install.sh && \
+    chmod +x dotnet-install.sh && \
+    ./dotnet-install.sh --version ${DOTNET_VERSION} --architecture ${ARCH} --os ${OS}
+
+ENV PATH $PATH:/root/.dotnet
+
+FROM dependencies AS publish
+ARG OS
+ARG ARCH
+
+WORKDIR /bin/modernuo
+
+COPY . .
+
+RUN ./publish.sh release ${OS} ${ARCH}
+
+FROM dependencies AS deploy
+ARG DOTNET_VERSION
+ARG ARCH
+
+ENV DOTNET_ROOT=/root/.dotnet
+
+RUN apt-get update -y \
+    && apt-get install -y \
+    libdeflate-dev zstd libargon2-dev
+
+WORKDIR /bin/modernuo
+
+COPY --from=publish /bin/modernuo/Distribution /bin/modernuo
+
+CMD '/bin/modernuo/ModernUO'

docker-compose.yml

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+services:
+  modernuo:
+    build:
+      context: .
+      args:
+        OS: "${OS:-linux}"
+        ARCH: "${ARCH:-amd64}"
+    environment:
+      UO_DIRECTORY: ${UO_DIRECTORY:-/bin/UO}
+    ports:
+      - "2593:2593"
+      - "12000:12000"
+    volumes:
+      - "./Distribution/Configuration:/bin/modernuo/Configuration"
+      - "./Distribution/Data:/bin/modernuo/Data"
+      - "./Distribution/Saves:/bin/modernuo/Saves"
+      # see the example in the DOCKER.md file to understand this volume
+      - "$UO_DIRECTORY:/bin/UO"