solucionado los build args

.dockerignore

@@ -0,0 +1,10 @@
+.git
+.next
+node_modules
+.env
+.env.*
+!.env.example
+*.md
+sprints/
+supabase/
+.claude/

Dockerfile

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+FROM node:20-alpine AS base
+
+# ── Dependencias ──────────────────────────────────────────────────────────────
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# ── Build ─────────────────────────────────────────────────────────────────────
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Las variables NEXT_PUBLIC_* se hornean en el bundle en build time.
+# Pasarlas como build args desde Dokploy (Environment → Build Args).
+ARG NEXT_PUBLIC_SUPABASE_URL
+ARG NEXT_PUBLIC_SUPABASE_ANON_KEY
+ENV NEXT_PUBLIC_SUPABASE_URL=$NEXT_PUBLIC_SUPABASE_URL
+ENV NEXT_PUBLIC_SUPABASE_ANON_KEY=$NEXT_PUBLIC_SUPABASE_ANON_KEY
+
+RUN npm run build
+
+# ── Runner ────────────────────────────────────────────────────────────────────
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser  --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+EXPOSE 3000
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]