Reduce Docker image layer size

.dockerignore

@@ -2,6 +2,7 @@ _site/
 .git/
 .claude/
 node_modules/
+images/
 .sass-cache/
 .jekyll-metadata
 *.md

Dockerfile

@@ -12,15 +12,26 @@ COPY . .
 
 RUN bundle exec jekyll build
 
-# === Serve-Phase: node.js backend + ImageMagick ===
+# === Node-Dependencies: native sqlite3 mit Build-Tools bauen ===
-FROM node:20-alpine
+FROM node:20-alpine AS node-deps
 
-# ImageMagick fuer Thumbnails, Docker CLI fuer Admin-Sync, Build-Tools fuer sqlite3 native bindings
+RUN apk add --no-cache python3 make g++ sqlite-dev
-RUN apk add --no-cache imagemagick docker-cli python3 make g++ build-base sqlite-dev
 
 WORKDIR /app
 COPY package*.json ./
-RUN npm install --omit=dev
+RUN npm ci --omit=dev && npm cache clean --force
+
+# === Serve-Phase: node.js backend + Runtime-Tools ===
+FROM node:20-alpine
+
+# Getrennte RUNs halten einzelne Registry-Layer klein genug fuer Proxy-Limits.
+RUN apk add --no-cache docker-cli
+RUN apk add --no-cache imagemagick
+RUN apk add --no-cache sqlite-libs
+
+WORKDIR /app
+COPY package*.json ./
+COPY --from=node-deps /app/node_modules ./node_modules
 
 COPY backend ./backend
 COPY --from=builder /site/_site ./public