add rust and cargo into one layer

Author: blankdots

Dockerfile

@@ -1,17 +1,14 @@
 FROM python:3.8-alpine3.13 as BACKEND
 
 RUN apk add --update \
-    && apk add --no-cache build-base curl-dev linux-headers bash git\
-    && apk add --no-cache libressl-dev libffi-dev\
+    && apk add --no-cache build-base curl-dev linux-headers bash git \
+    && apk add --no-cache libressl-dev libffi-dev rust cargo \
     && rm -rf /var/cache/apk/*
 
 COPY requirements.txt /root/swift_sharing/requirements.txt
 COPY setup.py /root/swift_sharing/setup.py
 COPY swift_x_account_sharing /root/swift_sharing/swift_x_account_sharing
 
-RUN apk add --no-cache rust cargo \
-    && rm -rf /var/cache/apk/*
-
 RUN pip install --upgrade pip\
     && pip install -r /root/swift_sharing/requirements.txt \
     && pip install /root/swift_sharing