Add 'Dockerfile'

Dockerfile

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+FROM node:14-buster AS build
+
+# Set working directory and node user
+WORKDIR /home/node/lowdefy
+
+RUN chown node:node /home/node/lowdefy
+
+USER node
+
+# Copy app config and change ownership of files to "node" user
+COPY  --chown=node:node  . .
+
+# Build the Lowdefy config using the Lowdefy CLI
+RUN npx lowdefy@3.23.2 build
+
+# Use the correct Lowdefy base image
+FROM lowdefy/lowdefy:3.23.2
+
+# Copy build output from build stage
+COPY --from=build --chown=node:node /home/node/lowdefy/.lowdefy/build ./build
+
+# Copy contents of public directory into image
+COPY --chown=node:node ./public ./public
+
+# Run the server on start
+CMD ["node", "./dist/server.js"]