restore process.env.MONGODB_URI for test-project

[dcousens]

@jesstelford as discussed, #1201 did not introduce CONNECT_TO as a Keystone-wide environment variable, but only for the keystone command. Thereby this had nothing set.

This resolves that, possibly.

[changeset-bot]

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[jesstelford]

Thanks!
One comment, and needs a Changeset too.

[jesstelford]

No need to add the value here, we don't want to force its usage, instead we can rely on the fallback.

[dcousens]

I think providing this here provides a good example for users to follow?

[jesstelford]

dotenv-safe will read .env.example for which env vars are required. With this change, if the environment doesn't provide a MONGODB_URI, dotenv-safe will throw an error, which is not what we want (we want it to default to the localhost fallback when not set), especially as this is a test project and we will be using an in-memory mongo server which is passed in manually (ie; not via an env var)

[dcousens]

Rebased and removed.