Move to plain alpine image to build pip dependencies successfully

docker-files/alpine.Dockerfile

@@ -4,13 +4,18 @@
 # https://github.com/nicolargo/glances
 #
 
-FROM python:3.9-alpine as build
+FROM alpine:3.13 as build
 
 RUN apk add --no-cache \
+  python3 \
   python3-dev \
+  py3-pip \
+  py3-wheel \
   musl-dev \
   linux-headers \
   build-base \
+  libzmq \
+  zeromq-dev \
   curl \
   lm-sensors \
   wireless-tools \
@@ -36,7 +41,7 @@ RUN CASS_DRIVER_NO_CYTHON=1 pip3 install --no-cache-dir --user -r optional-requi
 
 FROM build as dev
 
-COPY --from=additional-packages /root/.local/lib/python3.9/site-packages /usr/lib/python3.9/site-packages/
+COPY --from=additional-packages /root/.local/lib/python3.8/site-packages /usr/lib/python3.8/site-packages/
 COPY . /glances
 
 # EXPOSE PORT (XMLRPC / WebUI)
@@ -49,16 +54,17 @@ CMD python3 -m glances -C /glances/conf/glances.conf $GLANCES_OPT
 
 
 #Create running images without any building dependency
-FROM python:3.9-alpine as minimal
+FROM alpine:3.13 as minimal
 
 RUN apk add --no-cache \
+  python3 \
   curl \
   lm-sensors \
   wireless-tools \
   iputils
 
 COPY --from=remoteInstall /root/.local/bin /usr/local/bin/
-COPY --from=remoteInstall /root/.local/lib/python3.9/site-packages /usr/local/lib/python3.9/site-packages/
+COPY --from=remoteInstall /root/.local/lib/python3.8/site-packages /usr/lib/python3.8/site-packages/
 
 # EXPOSE PORT (XMLRPC / WebUI)
 EXPOSE 61209 61208
@@ -69,4 +75,4 @@ CMD python3 -m glances -C /glances/conf/glances.conf $GLANCES_OPT
 
 FROM minimal as full
 
-COPY --from=additional-packages /root/.local/lib/python3.9/site-packages /usr/lib/python3.9/site-packages/
+COPY --from=additional-packages /root/.local/lib/python3.8/site-packages /usr/local/python3.8/site-packages/