Deno Deploy layers

A layer's variables, inherited by every app that includes it, merged per key.

Connection

What	This provider
Vendor	Deno Deploy
Key	`deno-deploy-layer-env`
Availability	`available`. You can connect it today.
Credential we hold	`deno-token`
Values read back	no
Activation	`on-next-deploy`

Direction	What it does
`export`	We write names and values from your environment into the store.

Deno Deploy returns no value once it holds one, so we can write here and cannot read back.

on-next-deploy. A new value waits there and arrives with your next deploy.

Direction	Policies you can pick
`export`	`create_only`, `overwrite`, `overwrite_and_prune`

How syncs work says what each one does.

Paste a credential from the vendor. We seal it and never show it again.

Field	Label	Kind	Required	What it is
`token`	Access token	secret; we mask it here and seal it	yes	A Deno Deploy access token that can edit layers.

You answer these once per environment you map.

Field	Label	Kind	Required	Advanced	What it is
`layerSlug`	Layer	text	yes	no	The layer whose variables this environment maps onto. Every app that includes it reads them.
`context`	Context	choice	yes	yes	Deno keeps production, development and build as separate sets. One of Production, Development, Build. Starts at `production`.

We probe for these when we verify the connection.

Permission	Directions	Blocking	Without it
`layers:read`	every direction	yes	Preview cannot list the layer's variables.
`layers:write`	`export`	yes	Export cannot write anything.