Fix media permissions inside app container

Dockerfile

@@ -5,10 +5,10 @@
 # .env.example) - this image builds without a database connection.
 
 FROM node:22-alpine AS base
+RUN apk add --no-cache libc6-compat su-exec
 
 # ---- deps: install once, cached as its own layer -------------------------
 FROM base AS deps
-RUN apk add --no-cache libc6-compat
 WORKDIR /app
 COPY package.json package-lock.json ./
 RUN npm ci
@@ -41,7 +41,11 @@ COPY --from=builder --chown=nextjs:nodejs /app /app
 # Docker volumes mounted over these paths (see docker-compose.yml).
 RUN mkdir -p media backups && chown -R nextjs:nodejs media backups
 
-USER nextjs
+COPY --from=builder --chown=root:root /app/docker/anouma-entrypoint.sh /usr/local/bin/anouma-entrypoint.sh
+RUN chmod 755 /usr/local/bin/anouma-entrypoint.sh
+
+USER root
+ENTRYPOINT ["/usr/local/bin/anouma-entrypoint.sh"]
 
 EXPOSE 3000
 ENV PORT=3000