Replaced base Docker image with debian:buster-slim (#2373)

Using system Python 3 distribution (3.7.3) in order to allow the use of Debian packages for numpy, scipy, etc. without the need of building them or installing build dependencies.

Changed `#!/bin/sh` in shell scripts to `#!/bin/bash` to make `set -o pipefail` work.

{{cookiecutter.project_slug}}/compose/local/django/Dockerfile

@@ -1,19 +1,21 @@
-FROM python:3.7-alpine
+FROM debian:buster-slim
 
 ENV PYTHONUNBUFFERED 1
 
-RUN apk update \
+RUN apt-get update \
+  # dependencies for building Python packages
+  && apt-get install -y build-essential python3-dev python3-pip \
+  # link the system python3 as just python for convenience
+  && ln -s `which python3` /usr/local/bin/python \
+  # update pip et al
+  && pip3 install -U pip setuptools wheel \ 
   # psycopg2 dependencies
-  && apk add --virtual build-deps gcc python3-dev musl-dev \
-  && apk add postgresql-dev \
-  # Pillow dependencies
-  && apk add jpeg-dev zlib-dev freetype-dev lcms2-dev openjpeg-dev tiff-dev tk-dev tcl-dev \
-  # CFFI dependencies
-  && apk add libffi-dev py-cffi \
+  && apt-get install -y libpq-dev \
   # Translations dependencies
-  && apk add gettext \
-  # https://docs.djangoproject.com/en/dev/ref/django-admin/#dbshell
-  && apk add postgresql-client
+  && apt-get install -y gettext \
+  # cleaning up unused files
+  && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
+  && rm -rf /var/lib/apt/lists/*
 
 # Requirements are installed here to ensure they will be cached.
 COPY ./requirements /requirements

{{cookiecutter.project_slug}}/compose/local/django/celery/beat/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o nounset

{{cookiecutter.project_slug}}/compose/local/django/celery/flower/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o nounset

{{cookiecutter.project_slug}}/compose/local/django/celery/worker/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o nounset

{{cookiecutter.project_slug}}/compose/local/django/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o pipefail

{{cookiecutter.project_slug}}/compose/production/django/Dockerfile

@@ -9,21 +9,27 @@ RUN npm run build
 
 # Python build stage
 {%- endif %}
-FROM python:3.7-alpine
+FROM debian:buster-slim
 
 ENV PYTHONUNBUFFERED 1
 
-RUN apk update \
+RUN apt-get update \
+  # dependencies for building Python packages
+  && apt-get install -y build-essential python3-dev python3-pip \
+  # link the system python3 as just python for convenience
+  && ln -s `which python3` /usr/local/bin/python \
+  # update pip et al
+  && pip3 install -U pip setuptools wheel \ 
   # psycopg2 dependencies
-  && apk add --virtual build-deps gcc python3-dev musl-dev \
-  && apk add postgresql-dev \
-  # Pillow dependencies
-  && apk add jpeg-dev zlib-dev freetype-dev lcms2-dev openjpeg-dev tiff-dev tk-dev tcl-dev \
-  # CFFI dependencies
-  && apk add libffi-dev py-cffi
+  && apt-get install -y libpq-dev \
+  # Translations dependencies
+  && apt-get install -y gettext \
+  # cleaning up unused files
+  && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
+  && rm -rf /var/lib/apt/lists/*
 
-RUN addgroup -S django \
-    && adduser -S -G django django
+RUN addgroup --system django \
+    && adduser --system --ingroup django django
 
 # Requirements are installed here to ensure they will be cached.
 COPY ./requirements /requirements

{{cookiecutter.project_slug}}/compose/production/django/celery/beat/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o pipefail

{{cookiecutter.project_slug}}/compose/production/django/celery/flower/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o nounset

{{cookiecutter.project_slug}}/compose/production/django/celery/worker/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o pipefail

{{cookiecutter.project_slug}}/compose/production/django/entrypoint

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o pipefail

{{cookiecutter.project_slug}}/compose/production/django/start

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -o errexit
 set -o pipefail