Update Dockerfile

Dockerfile

@@ -8,7 +8,9 @@ WORKDIR /usr/src/app
 RUN mkdir -p /usr/src/app && chmod -R 777 /usr/src/app
 
 # Install masscan (you can adjust this if you're using a different tool)
-RUN apt-get update && apt-get install -y masscan
+RUN apt-get update && \
+    apt-get install -y masscan libpcap-dev && \
+    apt-get clean
 
 # Copy the script into the container at /usr/src/app
 COPY exclude.txt .