build(docker): switch to node:20 base (includes git) to satisfy HF build git config step

Dockerfile

@@ -1,10 +1,6 @@
-FROM node:20-alpine
+FROM node:20
 
-# Install required packages (git) as root to satisfy build steps
-USER root
-RUN apk add --no-cache git
-
-# Ensure non-root user for build/run
+# Ensure non-root user for build/run (node image has a non-root user with uid 1000)
 USER 1000
 WORKDIR /usr/src/app