Create docker

Dockerfile

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+# stage 1: build node frontend
+FROM node:21 as node-builder
+
+WORKDIR /node-builder
+COPY ./public ./public
+COPY ./src ./src
+COPY ./package.json .
+COPY ./package-lock.json .
+COPY ./tsconfig.json .
+
+RUN \
+    npm install && \
+    npm run build
+
+
+FROM busybox:1.36-musl
+
+RUN adduser -D pingator
+USER pingator
+WORKDIR /www
+
+COPY --from=node-builder /node-builder/build /www
+
+# Run BusyBox httpd
+CMD ["busybox", "httpd", "-f", "-v", "-h", "/www", "-p", "3000"]