Remove unnecessary native dependencies (#100)

* Remove JPEG and PostgreSQL native dependencies

* Move build deps back into .build-deps virtual package

Dockerfile

@@ -8,10 +8,8 @@ WORKDIR /code
 # Install native dependencies.
 RUN mkdir /data /run/nginx
 RUN pip install --upgrade pip pipenv
-RUN apk add --no-cache jpeg libcurl libpq nginx zlib
-RUN apk add --no-cache --virtual .build-deps
-RUN apk add --no-cache build-base
-RUN apk add --no-cache curl-dev jpeg-dev postgresql-dev zlib-dev
+RUN apk add --no-cache libcurl nginx
+RUN apk add --no-cache --virtual .build-deps build-base curl-dev
 
 FROM native-deps AS pipfile
 COPY Pipfile Pipfile.lock /code/

Pipfile

@@ -18,7 +18,7 @@ pdfrw = "*"
 reportlab = "*"
 requests = "*"
 requests-oauthlib = "*"
-psycopg = "*"
+psycopg = {extras = ["binary"],version = "*"}
 supervisor = "*"
 environs = {extras = ["django"],version = "*"}
 celery = {extras = ["sqs"],version = "*"}