Added volume mount for gcloud credentials

The GCloud credentials of the host computer user are exported as a
volume into the docker container for testing.

Makefile

@@ -1,6 +1,9 @@
 .PHONY: build up tests flake8 ci tests-with-cov
 
-all: build
+all: auth build run
+
+auth:
+	gcloud auth application-default login
 
 pytest:
 	python setup.py develop
@@ -15,4 +18,6 @@ run:
 	docker run -it cfr-numbermuncher:latest bin/install_bot.sh
 
 	# Spin up the docker instance to write out model weights
-	docker run -e GCS_OAUTH_TOKEN=`gcloud auth application-default print-access-token` -it cfr-numbermuncher:latest python -m cfretl.main
+	docker run -v ~/.config:/app/.config \
+		-e GOOGLE_CLOUD_PROJECT=moz-fx-data-derived-datasets \
+		-it cfr-numbermuncher:latest python -m cfretl.main

README.md

@@ -1,3 +1,5 @@
+# CFR Personalization ETL Server
+
 ## Setting up your dev enviroment:
 
 To run any of the test cases that query GCP directly, you'll need to
@@ -5,37 +7,42 @@ login to GCP using your own credentials.
 
 From the command line - issue: `gcloud auth application-default login`
 
-Long version:
-For the full details, see: https://docs.telemetry.mozilla.org/cookbooks/bigquery.html#from-client-sdks
+
+To build and startup the container - the simplest thing to do is to
+run
+
+```
+make all
+```
+
+---
+
+## Building the container
+
+A docker file is provided to build the container.  You can issue 
+`make build` to create a local image.
 
 
-# Testing the container
+# Kinto authentication
 
-The container is setup to use a default user with the following
-settings:
-
-Username: devuser
-Password: devpass
+The container is setup to use a default user with a username/password
+pair of : (devuser, devpass) against the kinto dev server.
 
 
 ## Building the container
 
-```
-make build
-```
+A standard Dockerfile is provided to build the container - the
+simplest thing to build the container is to issue: `make build`
 
 
 ## Install the devuser and setup cfr-control, cfr-experiments and cfr-models
 
+Use `make run` to spin up a testing container.
 
 This will install initial data into the dev instance of Remote
 Settings at https://kinto.dev.mozaws.net/v1 and start writing out
 weight updates.  Updates are currently set as a constant of 1 second
 updates to ease testing.
 
-The `run` target will automatically set the GCloud OAuth token as an
-enviroment variable in your docker container for you.
-
-```
-make run
-```
+The `run` target will automatically mount your GCloud authentication
+credentials into the `/app` home directory in the container.