Add rust toolchain to Dockerfile

The build failed due to the lack of rustc and cargo as dependencies for the
Python cryptography package.

Author: naltun

Dockerfile

@@ -1,7 +1,7 @@
 FROM python:3.8-alpine
 
 RUN apk upgrade
-RUN apk --update add --no-cache openssl-dev libffi-dev py3-pip python3 samba-client samba-common-tools yaml-dev
+RUN apk --update add --no-cache rust cargo openssl-dev libffi-dev py3-pip python3 samba-client samba-common-tools yaml-dev
 RUN apk --update add --virtual build-dependencies build-base git \
   && git clone https://github.com/cddmp/enum4linux-ng.git \
   && pip install -r enum4linux-ng/requirements.txt \