Deploy Django branch - Githubissues

https://docs.djangoproject.com/en/3.0/howto/deployment/

Go through checklist, notably:

Set environment variables from Salt:

Django variables
KINGFISHER_PROCESS_ENV=production
KINGFISHER_PROCESS_SECRET_KEY=
STATIC_ROOT if needed
KINGFISHER_PROCESS_SECURE_HSTS_SECONDS=31536000 (1 year) after testing on smaller values

Miscellaneous:

PostgreSQL: Change timezone to 'UTC'
Use Systemd to monitor workers (we already use it to monitor Scrapyd)

python manage.py migrate should create:

CREATE TABLE public.django_migrations (
    id integer NOT NULL,
    app character varying(255) NOT NULL,
    name character varying(255) NOT NULL,
    applied timestamp with time zone NOT NULL
);
CREATE SEQUENCE public.django_migrations_id_seq
    AS integer
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE
    NO MAXVALUE
    CACHE 1;
ALTER SEQUENCE public.django_migrations_id_seq OWNED BY public.django_migrations.id;
ALTER TABLE ONLY public.django_migrations ALTER COLUMN id SET DEFAULT nextval('public.django_migrations_id_seq'::regclass);
ALTER TABLE ONLY public.django_migrations
    ADD CONSTRAINT django_migrations_pkey PRIMARY KEY (id);

We can later manually drop:

alembic_version
transform_upgrade_1_0_to_1_1_status_release
transform_upgrade_1_0_to_1_1_status_record

As follow-up to #242, we can also drop:

release_check_error
record_check_error

open-contracting / kingfisher-process

Deploy Django branch #272