Add file

Dockerfile

 FROM ubuntu:oracular
 
-RUN apt update && apt install -y ca-certificates openssh-server python3-pip python3-dev xxd \
+RUN apt update && apt install -y ca-certificates openssh-server python3-pip python3-dev xxd file  \
                                 libssl-dev libffi-dev build-essential binutils-multiarch git gdb gdb-multiarch ltrace strace tmux wget curl && \
                                 apt clean && rm -rf /var/lib/apt/lists/* && touch /root/.hushlogin
 

README.md

@@ -79,7 +79,7 @@ There are probably way more useful tools, but here's a list to get started.
 
 ```bash
 sudo apt install -y xxd gdb gdb-multiarch gdbserver binutils binutils-multiarch \
-    tmux wget curl socat strace ltrace git git-lfs \
+    tmux wget curl socat strace ltrace git git-lfs file \
 ```
 
 ### pwndbg