chore(ci): use alpine base for simple docker build

Dockerfile.simple

@@ -1,4 +1,4 @@
-FROM node:20-slim
+FROM node:20-alpine
 
 WORKDIR /app
 
@@ -6,8 +6,8 @@ WORKDIR /app
 ENV PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1
 ENV CYPRESS_INSTALL_BINARY=0
 
-# Install dependencies
-RUN apt-get update && apt-get install -y python3 make g++ && rm -rf /var/lib/apt/lists/*
+# Install build dependencies
+RUN apk add --no-cache python3 make g++
 
 # Copy package files
 COPY package*.json ./