Add a docker-compose file

This describes the full container stack to be used in production.

conf/config.py.docker

@@ -0,0 +1,16 @@
+import os
+SECRET_KEY = os.environ.get("SECRET_KEY", "xx")
+SASSC_LOCATION  = os.environ.get("SASSC_LOCATION", "sassc")
+
+REPOSITORY_DB_HOST = os.environ.get("REPOSITORY_DB_HOST", "postgres")
+REPOSITORY_DB_PORT = os.environ.get("REPOSITORY_DB_PORT", "5432")
+REPOSITORY_DB_USER = os.environ.get("REPOSITORY_DB_USER", "caps")
+REPOSITORY_DB_NAME = os.environ.get("REPOSITORY_DB_NAME", "caps")
+REPOSITORY_DB_PASS = os.environ.get("REPOSITORY_DB_PASS", "caps")
+
+MAPIT_URL = 'https://mapit.mysociety.org'
+
+CACHE_FILE = 'data/cache'
+
+SOLR_URL = os.environ.get("SOLR_URL", "http://solr:8983/solr/caps")
+SOLR_ADMIN_URL = os.environ.get("SOLR_ADMIN_URL", "http://solr:8983/solr/admin/cores")

docker-compose.yml

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+version: '3.7'
+
+services:
+  app:
+    image: mysocietyorg/caps:${TAG:-latest}
+    build:
+      context: .
+      dockerfile: Dockerfile
+    command: /usr/src/app/script/server
+    volumes:
+      - ./media:/usr/src/app/media
+      - ./data:/usr/src/app/data
+      - ./conf/config.py.docker:/usr/src/app/conf/config.py
+    ports:
+      - ${PORT:-8000}:8000
+    environment:
+      - REPOSITORY_DB_PASS=${REPOSITORY_DB_PASS:-caps}
+      - SECRET_KEY=${SECRET_KEY:-xx}
+    depends_on:
+      - postgres
+      - solr
+
+  postgres:
+    image: postgres:11
+    volumes:
+      - postgres_data:/var/lib/postgresql/data/
+    environment:
+      - POSTGRES_USER=${REPOSITORY_DB_USER:-caps}
+      - POSTGRES_PASSWORD=${REPOSITORY_DB_PASS:-caps}
+      - POSTGRES_DB=${REPOSITORY_DB_NAME:-caps}
+
+  solr:
+    image: solr:6
+    volumes:
+      - solr_data:/opt/solr/server/solr/mycores
+      - ./conf/schema.xml:/opt/solr/server/solr/configsets/basic_configs/conf/schema.xml
+      - ./conf/solrconfig.xml:/opt/solr/server/solr/configsets/basic_configs/conf/solrconfig.xml
+    command:
+      - solr-precreate
+      - caps
+      - /opt/solr/server/solr/configsets/basic_configs
+
+volumes:
+  postgres_data:
+  solr_data: