Switched docker to debian and preinstalled conda

Dockerfile

-FROM python:2.7-alpine
+FROM debian:latest
 
 ENV PYTHONUNBUFFERED 1
 ENV DEBIAN_FRONTEND noninteractive
 
 ADD ./requirements.txt /pulsar/ 
 
-RUN apk update \
-    # psycopg2 dependencies
-    && apk add --no-cache --virtual build-deps gcc python-dev musl-dev \
-    # CFFI dependencies
-    && apk --no-cache add libffi-dev py-cffi \
-    && apk --no-cache add make linux-headers \
+RUN apt-get update \
+    # build dependencies
+    && apt-get install -y --no-install-recommends apt-utils build-essential python-setuptools python-dev python-pip \
     \
-    # Install python requirements
+    # preinstall conda for faster startup
+    && apt-get -y install curl bzip2 \
+    && curl -sSL https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -o /tmp/miniconda.sh \
+    && bash /tmp/miniconda.sh -bfp /pulsar/dependencies/_conda \
+    && rm -rf /tmp/miniconda.sh \
+    \
+    # Install pulsar python requirements
     && pip install --no-cache-dir -r /pulsar/requirements.txt \
     \
-    # Remove build deps
-    && apk del build-deps \
-    && rm /var/cache/apk/*
+    # Remove build deps and cleanup
+    && apt-get -y remove curl bzip2 \
+    && apt-get -y autoremove \
+    && apt-get autoclean \
+    && rm -rf /var/lib/apt/lists/* /var/log/dpkg.log
 
 # Create pulsar user environment
-RUN adduser -D -g '' pulsar \
+RUN adduser --disabled-password --gecos '' pulsar \
     && mkdir -p /pulsar    
     
 # Set working directory to /pulsar/
@@ -41,4 +46,4 @@ USER pulsar
 # gunicorn will listen on this port
 EXPOSE 8913
 
-CMD sh /usr/local/bin/pulsar
\ No newline at end of file
+CMD /usr/local/bin/pulsar