add docker-compose file (#4)

* docker-compose file

* added .env.example

* updated README

.env.example

@@ -0,0 +1,3 @@
+DEBUG=true
+SECRET_KEY=keyboard-mash
+DATABASE_URL=postgres://postgres:postgres@db/consvc_shepherd

README.md

@@ -9,7 +9,8 @@ reducing the need for deployments of the services that use it.
 To use consvc-shepherd, you'll need a Python 3.10 development environment.
 
 You'll need to specify some minimal configuration. Create a file `.env` and put
-in it at least:
+in it at least, if using the docker workflow, you may want to use `.env.example` 
+and rename it to `env`:
 
 ```shell
 DEBUG=true
@@ -47,3 +48,15 @@ $ ./manage.py runserver
 This will start a development server that reloads on changes to the files. You
 can access the configuration part of the site at
 [localhost:8000/admin][http://localhost:8000/admin].
+
+### Docker set up
+
+Start with building and get it up with:
+```
+docker compose build
+docker compose up
+```
+To create a user, shell into the container and run
+``` 
+./manage.py createsuperuser
+```

docker-compose.yml

@@ -0,0 +1,45 @@
+version: "3"
+
+services:
+  db:
+    restart: always
+    image: postgres:14.0
+    volumes:
+      - db_volume:/var/lib/postgresql
+    environment:
+      POSTGRES_DB: consvc_shepherd
+      POSTGRES_HOST_AUTH_METHOD: trust
+    ports:
+      - "5432:5432"
+    networks:
+      - private_nw
+
+  app:
+    tty: true
+    env_file:
+      - .env
+    build:
+      context: ./
+      dockerfile: ./Dockerfile
+    command: bash -c "python /app/manage.py migrate && python /app/manage.py runserver 0:8000"
+    links:
+      - db
+    networks:
+      - public_nw
+      - private_nw
+    volumes:
+      - .:/app
+    ports:
+      - "8000:8000"
+    depends_on:
+      - db
+
+volumes:
+  db_volume:
+  node_modules_volume:
+  ssl_volume:
+
+networks:
+  private_nw:
+    internal: true
+  public_nw:

requirements.in

@@ -15,4 +15,5 @@ flake8
 mypy
 django-environ
 django-storages[google]
-django-countries
+django-countries
+psycopg2

requirements.txt

@@ -82,6 +82,8 @@ protobuf==3.19.4
     #   google-api-core
     #   google-cloud-storage
     #   googleapis-common-protos
+psycopg2==2.9.3
+    # via -r requirements.in
 pyasn1==0.4.8
     # via
     #   pyasn1-modules