fix: docker build fallaba por public/ ausente y login alineado con sam-portal

Dockerfile

@@ -18,8 +18,8 @@ FROM base AS runner
 WORKDIR /app
 ENV NODE_ENV=production
 
-RUN addgroup --system --gid 1001 nodejs
-RUN adduser --system --uid 1001 nextjs
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser --system --uid 1001 -G nodejs nextjs
 
 COPY --from=builder /app/public ./public
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./