Move to the python:alpine docker image (#1482)

* Move to the python:alpine docker image

- Switch the base images for local and production to alpine
- Install extra dependencies for psycopg2, Pillow and cffi
- Change shebang for shell scripts to use sh instead of bash

* Move to the python:alpine docker image

- Migrate group and user creation to Alpine syntax

* Move to the python:alpine docker image

- Remove `function` keyword, unsupported in shell

* Upgrade various places to the latest Python 3.6

* Test support for translations

* Add gettext library, required for translations support

* Add locale folder for translations support with README documenting it

* Update Changelog

* Tweak command to test translations support

tests/test_docker.sh

@@ -19,3 +19,6 @@ docker-compose -f local.yml run django python manage.py test
 
 # return non-zero status code if there are migrations that have not been created
 docker-compose -f local.yml run django python manage.py makemigrations --dry-run --check || { echo "ERROR: there were changes in the models, but migration listed above have not been created and are not saved in version control"; exit 1; }
+
+# Test support for translations
+docker-compose -f local.yml run --rm django python manage.py makemessages

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

@@ -1,7 +1,18 @@
-FROM python:3.6
+FROM python:3.6-alpine
 
 ENV PYTHONUNBUFFERED 1
 
+RUN apk update \
+  # 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 openssl-dev py-cffi \
+  # Translations dependencies
+  && apk add gettext
+
 # Requirements have to be pulled and installed here, otherwise caching won't work
 COPY ./requirements /requirements
 RUN pip install -r /requirements/local.txt

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

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

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

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

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

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

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

@@ -1,9 +1,18 @@
-FROM python:3.6
+FROM python:3.6-alpine
 
 ENV PYTHONUNBUFFERED 1
 
-RUN groupadd -r django \
-    && useradd -r -g django django
+RUN apk update \
+  # 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 openssl-dev py-cffi
+
+RUN addgroup -S django \
+    && adduser -S -G django django
 
 # Requirements have to be pulled and installed here, otherwise caching won't work
 COPY ./requirements /requirements

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

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

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

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

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

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -o errexit
 set -o pipefail
@@ -25,7 +25,7 @@ export DATABASE_URL=postgres://$POSTGRES_USER:$POSTGRES_PASSWORD@postgres:5432/$
 export CELERY_BROKER_URL=$REDIS_URL/0
 {% endif %}
 
-function postgres_ready(){
+postgres_ready() {
 python << END
 import sys
 import psycopg2

{{cookiecutter.project_slug}}/compose/production/django/gunicorn.sh

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

{{cookiecutter.project_slug}}/locale/README.rst

@@ -0,0 +1,6 @@
+Translations
+============
+
+Translations will be placed in this folder when running::
+
+    python manage.py makemessages