Export muliple inline environments

[Duologic]

I have a decent use case for working with multiple inline environments in a single flow.

At Grafana Labs, we are rolling out several new clusters. These clusters need a common set of applications defined in different Tanka environments. To make this work now, we have to bootstrap multiple environments for each cluster/application combo. This is quite a burden and often less importent applications get ignored or forgotten as the operator already has a heap of work he has to put in while rolling out new clusters

With multiple inline environments, we could loop over an array of clusters and just render the same jsonnet for each. When a new cluster gets created, the operator would only need to add that cluster to one single array and tanka will take care of the rest.

This is a tangent on #414.

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