Dockerfile: build with clean alpine

Dockerfile

@@ -1,20 +1,16 @@
-FROM docker.io/library/node:20-alpine AS build_node_modules
+FROM alpine:latest AS build_node_modules
 
-# Hide fund and update-notifier message
-RUN npm config set -g fund false &&\
-    npm config set -g update-notifier false
+RUN apk add -U --no-cache \
+    npm \
+    nodejs
 
 # Copy Web UI
 COPY src/ /app/
 WORKDIR /app
 RUN npm ci
 # Copy build result to a new image.
 # This saves a lot of disk space.
-FROM docker.io/library/node:20-alpine
-
-# Hide fund and update-notifier message
-RUN npm config set -g fund false &&\
-    npm config set -g update-notifier false
+FROM alpine:latest
 
 COPY --from=build_node_modules /app /app
 
@@ -32,6 +28,8 @@ RUN npm i -g nodemon
 
 # Install Linux packages
 RUN apk add -U --no-cache \
+    npm \
+    nodejs \
     iptables \
     wireguard-tools \
     dumb-init