Create a dev docker container for makemigrations

* Adds a laptop-mode-env file which docker can read env variables from
* Adds a Dockerfile.makemigrations; mostly identical to the main
  Dockerfile. Important difference: instead of the source being copied
  into the docker image at build time, it's mounted from the local
  machine at run time.
* Adds a makemigrations shell script which builds an imagine using the
  Dockefile.makemigrations and then uses it to run makemigrations
* Because the source is mounted from the local machine, any new
  migrations created are dumped in the developer's git checkout ready
  for adding to git.

Rename .env -> docker/laptop-mode-env

docker/Dockerfile.makemigrations

@@ -0,0 +1,22 @@
+FROM python:3.6
+VOLUME /source
+COPY constraints.txt requirements.txt /setup/
+RUN set -ex \
+    && buildDeps=' \
+        libmysqlclient-dev \
+        libffi-dev \
+        libfreetype6-dev \
+        libjpeg-dev \
+        libwebp-dev \
+        libpng-dev \
+        liblcms2-dev \
+        zlib1g-dev \
+        libmemcached-dev \
+        libsasl2-dev \
+    ' \
+    && apt-get update \
+    && apt-get install -y git xmlsec1 libmysqlclient18 \
+    && apt-get install -y $buildDeps --no-install-recommends
+RUN pip install -c /setup/constraints.txt -r /setup/requirements.txt
+CMD ["python","/source/manage.py", "makemigrations"]
+

docker/laptop-mode-env

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+DJANGO_SECRET_KEY=5CEA51A5-A613-4AEF-A9FB-D0A57D77C13B
+STRIPE_PUBLIC_KEY=5CEA51A5-A613-4AEF-A9FB-D0A57D77C13B
+STRIPE_SECRET_KEY=5CEA51A5-A613-4AEF-A9FB-D0A57D77C13B
+GCS_BUCKET=5CEA51A5-A613-4AEF-A9FB-D0A57D77C13B
+GOOGLE_APPLICATION_CREDENTIALS=/dev/null
+DATABASE_URL=sqlite:////tmp/symposion.sqlite

make_dev_container.sh

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+#!/bin/bash -x
+
+CONTAINER_NAME=${1:-symposion_app}
+
+docker image build -f docker/Dockerfile -t ${CONTAINER_NAME} .
+docker container stop symposion
+docker container rm symposion
+docker container create --env-file docker/laptop-mode-env -p 28000:8000 --name symposion ${CONTAINER_NAME}
+docker container start symposion
+docker exec symposion ./manage.py migrate
+docker exec symposion ./manage.py loaddata ./fixtures/*.json
+docker exec symposion ./manage.py create_review_permissions
+docker exec -it symposion ./manage.py createsuperuser
+
+## The following sets up everything required for rego - tickets and
+## t-shirts and stuff. At this stage, it's not something we want.
+
+#docker exec symposion ./manage.py populate_inventory

makemigrations.sh

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+#!/bin/bash -x
+docker image build -f docker/Dockerfile.makemigrations -t makemigrations .
+docker run -it --env-file=docker/laptop-mode-env -v $(pwd):/source makemigrations
+