chore: add Dockerfile for the map-selector

Dockerfile

@@ -0,0 +1,38 @@
+# syntax = docker/dockerfile:1
+
+# Use Node.js base image
+FROM node:20-slim as base
+
+LABEL fly_launch_runtime="Node.js"
+
+# App lives here
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV="production"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base as build
+
+# Install packages needed to build node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential pkg-config python-is-python3
+
+# Install node modules
+COPY package-lock.json package.json ./
+RUN npm install --ignore-scripts
+
+# Copy application code
+COPY . .
+
+
+# Final stage for app image
+FROM base
+
+# Copy built application
+COPY --from=build /app /app
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 3000
+CMD [ "node", "./map-selector/index.js" ]