better device scan. less dependencies. ip regex

Dockerfile

@@ -19,10 +19,7 @@ COPY --from=builder /install /usr/local
 COPY app /app
 WORKDIR /app
 RUN apt-get update && \
-    apt-get -y install iputils-ping && \
-    rm -rf /var/lib/apt/lists/* && \
-    groupadd user && useradd -M user -g user && \
-    chmod -R 755 /app && chown -R user:user /app
-USER user
+    apt-get -y install iputils-ping nmap && \
+    rm -rf /var/lib/apt/lists/*
 
 CMD ["./run.sh"]