merging PR Chaosthebot#499: add a docker debug environment

Chaosthebot#499: add a docker debug environment

Description:
this way `import pdb; pdb.set_trace()` will work correctly when debugging your code

:white_check_mark: PR passed with a vote of 8 for and 0 against, a weighted total of 8.0 and a threshold of 6.5, and a current meritocracy review.

Vote record:
@Leigende: 1
@PlasmaPower: 1
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@amoffat: 1
@andrewda: 1
@e-beach: 1
@hongaar: 1
@mark-i-m: 1

dev/docker/README.md

@@ -47,17 +47,21 @@ You can simply run `docker-compose up chaos`.
 
 Or you can run with `bash run.sh` or `run.bat`.
 
+## Debugging
+
+To debug your code, you probably want to drop into a debugger via `import pdb;
+pdb.set_trace()`.  To do this, you need to run `docker-compose run debug`, will
+run the chaos container in interactive mode, and without starting under
+[supervisor](http://supervisord.org/).  Starting chaos this way will let you
+interact with the debugger.
+
 ## Testing
 
 Make sure you're in `dev/docker/`.
 You can simply run `docker-compose up tests`.
 
 Or you can also run tests with `bash test.sh` or `test.bat`.
 
-## Testing
-
-You can run tests with `bash test.sh` or `test.bat`.
-
 ## Development Cycle
 
 The repo dir exists as a mounted [data

dev/docker/docker-compose.yml

@@ -23,6 +23,20 @@ services:
     volumes:
       - ../..:/root/workspace/Chaos
 
+  debug:
+    image: chaos
+    build:
+      context: ../..
+      dockerfile: ./dev/docker/Dockerfile
+    command: python chaos.py
+    depends_on:
+      - db
+    ports:
+      - 8082:80
+      - 8081:8081
+    volumes:
+      - ../..:/root/workspace/Chaos
+
   db:
      image: mysql:5.7
      volumes: