docker: persist redis data, fixes #17

.gitignore

@@ -133,4 +133,7 @@ dmypy.json
 *.swp
 *~
 node_modules
-projects_dir
+
+# Standards Lab build files
+projects_dir
+_build

docker-compose.yml

@@ -29,3 +29,6 @@ services:
 
   redis:
     image: redis:6.0.10
+    command: ["redis-server", "--appendonly", "yes"]
+    volumes:
+      - ./_build/redis-data:/data

docs/developer/core-components.md

@@ -55,6 +55,8 @@ The API provides endpoints primarily for the VueJS application. All responses ar
 
 The processor is responsible for starting, defining and communicating with processing jobs. Each processor implements a `start` function and a `monitor` function.
 
+When you run Standards Lab using docker-compose, the redis queue data is persisted in the `_build/redis-data/` directory.
+
 ## Utils
 
 Utility functions that are common to all of the django applications.