feat(docker): add alpine image with minimum dependencies

Dockerfiles/alpine.Dockerfile

@@ -1,30 +1,22 @@
-FROM python:3.7.4-alpine AS dependency
+FROM python:3.7.4-alpine AS base
 
 WORKDIR /gnes/
 
-COPY setup.py ./setup.py
+ADD . ./
 
 RUN apk add --no-cache \
             --virtual=.build-dependencies \
-            build-base g++ gfortran file binutils zeromq-dev libzmq \
+            build-base g++ gfortran file binutils zeromq-dev \
             musl-dev python3-dev py-pgen cython openblas-dev && \
-    apk add libstdc++ openblas && \
+    apk add --no-cache libstdc++ openblas libzmq && \
     ln -s locale.h /usr/include/xlocale.h && \
-    python -c "import distutils.core;s=distutils.core.run_setup('setup.py').install_requires;f=open('requirements_tmp.txt', 'w');[f.write(v+'\n') for v in s];f.close()" && \
-    cat requirements_tmp.txt && \
-    pip install --no-cache-dir --compile -r requirements_tmp.txt && \
+    pip install . --no-cache-dir --compile && \
     find /usr/lib/python3.7/ -name 'tests' -exec rm -r '{}' + && \
     find /usr/lib/python3.7/site-packages/ -name '*.so' -print -exec sh -c 'file "{}" | grep -q "not stripped" && strip -s "{}"' \; && \
     rm /usr/include/xlocale.h && \
-    apk del .build-dependencies
-
-FROM dependency as base
-
-ADD . ./
-
-RUN pip install . --no-cache-dir --compile && \
     rm -rf /tmp/* && \
-    rm -rf /gnes
+    rm -rf /gnes && \
+    apk del .build-dependencies
 
 WORKDIR /