Added docker build and quick-start

.dockerignore

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+# Include any files or directories that you don't want to be copied to your
+# container here (e.g., local build artifacts, temporary files, etc.).
+#
+# For more help, visit the .dockerignore file reference guide at
+# https://docs.docker.com/go/build-context-dockerignore/
+
+**/.DS_Store
+**/.classpath
+**/.dockerignore
+**/.env
+**/.factorypath
+**/.git
+**/.gitignore
+**/.idea
+**/.project
+**/.sts4-cache
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/.next
+**/.cache
+**/*.dbmdl
+**/*.jfm
+**/charts
+**/docker-compose*
+**/compose.y*ml
+**/Dockerfile*
+**/secrets.dev.yaml
+**/values.dev.yaml
+**/vendor
+LICENSE
+README.md
+**/*.class
+**/*.iml
+**/*.ipr
+**/*.iws
+**/*.log
+**/.apt_generated
+**/.gradle
+**/.gradletasknamecache
+**/.nb-gradle
+**/.springBeans
+**/build
+**/dist
+**/gradle-app.setting
+**/nbbuild
+**/nbdist
+**/nbproject/private
+**/target
+*.ctxt
+.mtj.tmp
+.mvn/timing.properties
+buildNumber.properties
+dependency-reduced-pom.xml
+hs_err_pid*
+pom.xml.next
+pom.xml.releaseBackup
+pom.xml.tag
+pom.xml.versionsBackup
+release.properties
+replay_pid*

DEVELOPERS.md

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+# For developers and contributors
+
+This document is for developers who want to make modifications to OIE. If you are a user who wants to run and use OIE, please review [the README](./README.md) or the full documentation see [docs.openintegrationengine.org](https://docs.openintegrationengine.org/engine/contributing.html).
+
+There are two ways to build and run OIE locally. The reccommended way is to use Docker. OIE can also be run with traditional build tools. 
+
+Both are described here. We suggest the Docker approach for most use cases.
+
+For either approach we also strongly suggest using a launcher. The preferred launcher is [Ballista](https://github.com/kayyagari/ballista) but the Bridge Link launcher and the NextGen Mirth Connect Admin Launcher are known to work.
+
+## Local Build and Run Using Docker 
+
+This is the preferred approach. The Docker image in the `engine` repository is maintained with the correct JDK, build steps, and best practices. 
+
+```bash
+# Build using docker
+docker build -t oie-dev .
+
+# Start an ephemeral image
+# NOTE: All data will be deleted on stop due to --rm.  Use a volume for "real" use.
+docker run --rm -p 8443:8443 oie-dev
+
+# Connect using Ballista or another launcher at https://localhost:8443
+```
+## Local Build and Run using Ant
+
+This is the older, traditional approach from the now closed-source Mirth Connect project. OIE is working to modernize the build system. The Docker approach is likely to be faster and more reliable and better supported.
+
+```bash
+# Install dependencies manually or use https://sdkman.io/
+sdk env install
+
+# Build the server
+# NOTE: Building will delete any existing server configuration!
+ant -f server/mirth-build.xml -DdisableSigning=true
+
+# Run the server
+server/setup/oieserver
+
+# Connect using Ballista or another launcher at https://localhost:8443
+```

Dockerfile

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+# syntax=docker/dockerfile:1.19.0
+# SPDX-License-Identifier: MPL-2.0
+# SPDX-FileCopyrightText: 2025 Mitch Gaffigan
+
+# Stages:
+# 1. Builder Stage: Compiles the application and resolves dependencies.  Produces
+#    JAR files that can be deployed.
+#      1a. Install dependencies
+#      1b. Build the application
+# 2. Runner Stage: Creates a lightweight image that runs the application using the JRE.
+
+FROM ubuntu:noble-20251013 AS builder
+WORKDIR /app
+# sdkman requires bash
+SHELL ["/bin/bash", "-c"]
+
+# Stage 1a: Install dependencies
+# Install necessary tools
+COPY .sdkmanrc .
+RUN apt-get update\
+    && apt-get install -y zip curl\
+    && curl -s "https://get.sdkman.io?ci=true" | bash \
+    && source "$HOME/.sdkman/bin/sdkman-init.sh" && sdk env install \
+    && rm -rf /var/lib/apt/lists/*
+
+# Stage 1b: Build the application
+# Copy the entire source tree (excluding .dockerignore files), and build
+COPY . .
+WORKDIR /app/server
+RUN source "$HOME/.sdkman/bin/sdkman-init.sh" \
+    && ANT_OPTS="-Dfile.encoding=UTF8" ant -f mirth-build.xml -DdisableSigning=true
+
+##########################################
+#
+#     Ubuntu JDK Image
+#
+##########################################
+
+FROM eclipse-temurin:21.0.9_10-jdk-noble AS jdk-run
+
+RUN groupadd engine \
+    && usermod -l engine ubuntu \
+    && adduser engine engine \
+    && mkdir -p /opt/engine/appdata \
+    && chown -R engine:engine /opt/engine
+
+WORKDIR /opt/engine
+COPY --chown=engine:engine --from=builder \
+    --exclude=cli-lib \
+    --exclude=mirth-cli-launcher.jar \
+    --exclude=mccommand \
+    --exclude=manager-lib \
+    --exclude=mirth-manager-launcher.jar \
+    --exclude=mcmanager \
+    /app/server/setup ./
+
+VOLUME /opt/engine/appdata
+VOLUME /opt/engine/custom-extensions
+EXPOSE 8443
+
+USER engine
+ENTRYPOINT ["./configure-from-env.sh"]
+CMD ["./oieserver"]
+
+##########################################
+#
+#     Alpine JRE Image
+#
+##########################################
+
+FROM eclipse-temurin:21.0.9_10-jre-alpine AS jre-run
+
+# Alpine does not include bash by default, so we install it
+RUN apk add --no-cache bash
+# useradd and groupadd are not available in Alpine
+RUN addgroup -S engine \
+    && adduser -S -g engine engine \
+    && mkdir -p /opt/engine/appdata \
+    && chown -R engine:engine /opt/engine
+
+WORKDIR /opt/engine
+COPY --chown=engine:engine --from=builder \
+    --exclude=cli-lib \
+    --exclude=mirth-cli-launcher.jar \
+    --exclude=mccommand \
+    --exclude=manager-lib \
+    --exclude=mirth-manager-launcher.jar \
+    --exclude=mcmanager \
+    /app/server/setup ./
+
+VOLUME /opt/engine/appdata
+VOLUME /opt/engine/custom-extensions
+
+EXPOSE 8443
+
+USER engine
+ENTRYPOINT ["./configure-from-env"]
+CMD ["./oieserver"]