fixing some docker issues

Dockerfile

@@ -1,50 +1,46 @@
 FROM node:22-slim
 
+ARG TARGETARCH
+
 # System deps for Chrome for Testing + build tools for native modules (better-sqlite3)
-# Must run as root
+# On ARM64 we also install system Chromium (Chrome for Testing has no ARM64 binary)
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl ca-certificates fonts-liberation libasound2 \
     libatk-bridge2.0-0 libatk1.0-0 libcups2 libdbus-1-3 \
     libdrm2 libgbm1 libgtk-3-0 libnspr4 libnss3 \
     libx11-xcb1 libxcomposite1 libxdamage1 libxrandr2 xdg-utils \
     python3 make g++ \
+  && if [ "$TARGETARCH" = "arm64" ]; then apt-get install -y --no-install-recommends chromium; fi \
   && rm -rf /var/lib/apt/lists/* \
-  && mkdir -p /db /conf /fredy \
-  && chown node:node /db /conf /fredy
+  && mkdir -p /db /conf /fredy
 
 WORKDIR /fredy
 
-# Everything from here runs as the built-in non-root node user (UID 1000)
-USER node
-
 ENV NODE_ENV=production \
     IS_DOCKER=true
 
-COPY --chown=node:node package.json yarn.lock ./
+COPY package.json yarn.lock ./
 
 # Install dependencies and purge build tools (only needed to compile better-sqlite3)
 RUN yarn config set network-timeout 600000 \
   && yarn --frozen-lockfile \
   && yarn cache clean
 
-# Install Chrome for Testing in a separate layer — it's ~150MB and rarely changes,
-# so keeping it separate avoids re-downloading on every code/dependency change
-RUN npx puppeteer browsers install chrome
+# on arm64 use the system Chromium installed above
+RUN if [ "$TARGETARCH" != "arm64" ]; then npx puppeteer browsers install chrome; fi
 
 # Purge build tools now that native modules are compiled
-USER root
 RUN apt-get purge -y python3 make g++ \
   && apt-get autoremove -y \
   && rm -rf /var/lib/apt/lists/*
-USER node
 
-COPY --chown=node:node index.html vite.config.js ./
-COPY --chown=node:node ui ./ui
-COPY --chown=node:node lib ./lib
+COPY index.html vite.config.js ./
+COPY ui ./ui
+COPY lib ./lib
 
 RUN yarn build:frontend
 
-COPY --chown=node:node index.js ./
+COPY index.js ./
 
 RUN ln -s /db /fredy/db \
   && ln -s /conf /fredy/conf