Add Docker support (#8)

Dockerfile and docker-compose.yml contributed by @mike1237. Thanks for the contribution!

Dockerfile

@@ -0,0 +1,37 @@
+# Use the official Node.js LTS Alpine image for a lightweight footprint
+FROM node:20-alpine
+
+# Install OpenSSL (Required by Haven to auto-generate self-signed certs for HTTPS/Voice)
+RUN apk update && apk add --no-cache openssl
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the package.json and package-lock.json (if available)
+COPY package*.json ./
+
+# Install Node.js dependencies
+RUN npm install
+
+# Copy the rest of the application source code
+COPY . .
+
+# Set environment variables
+ENV PORT=3000
+# Tell Haven to store its database, .env config, and certificates here
+ENV HAVEN_DATA_DIR=/data 
+
+# Create the persistent data directory and ensure the 'node' user owns it
+RUN mkdir -p /data && chown -R node:node /app /data
+
+# Run the container as the non-root 'node' user for better security
+USER node
+
+# Expose the default Haven port
+EXPOSE 3000
+
+# Create a volume mount point so data survives container restarts
+VOLUME ["/data"]
+
+# Start the Haven server
+CMD ["node", "server.js"]

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  haven:
+    build: .
+    container_name: haven
+    ports:
+      - "3000:3000"
+    volumes:
+      - haven_data:/data
+    restart: unless-stopped
+
+volumes:
+  haven_data: