add dockerfile

Dockerfile

@@ -0,0 +1,20 @@
+# Using official node image as a parent image
+FROM public.ecr.aws/docker/library/node:20-alpine3.18
+
+# Create working directory
+RUN mkdir /app
+
+# Setting the working directory to /app
+WORKDIR /app
+
+# Copy the current directory contents into the container at /app
+COPY . /app
+
+# Install AirSignal dependencies
+RUN npm install
+
+# AirSignal port
+EXPOSE 12776
+
+# Run AirSignal when the container launches
+CMD ["node", "server.js"]