Development guide missing `CONFIGURE_SUBSCRIPTION_INSTANCES`

[dwrusse]

Following the Azure Integration Development leads to an error when running yarn start because the CONFIGURE_SUBSCRIPTION_INSTANCES configuration parameter is missing.

[pshelton-skype]

We also see this in the Docker instructions:

D:\src\starbase>docker-compose run starbase setup
yarn run v1.22.17
$ ts-node ./src/index.ts setup
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
ERROR:  instanceConfigFields validation error(s) for graph-azure:   [
  {
    instancePath: '',
    schemaPath: '#/required',
    keyword: 'required',
    params: { missingProperty: 'CONFIGURE_SUBSCRIPTION_INSTANCES' },
    message: "must have required property 'CONFIGURE_SUBSCRIPTION_INSTANCES'"
  }
]
ERROR:  Configurations for 1 integration(s) failed validation tests.  Please correct above error messages and retry.
Done in 313.86s.

[pshelton-skype]

Looks like the variable was introduced in 3fee8be and controls whether to read a single subscription or a management group.

Since my use-case doesn't involve management groups, I set CONFIGURE_SUBSCRIPTION_INSTANCES: true in config.yaml and re-ran:

docker build -t starbase:latest . 
docker-compose run starbase setup

and seem to be back in business.