Hypercore Secret Key option

[urgent]

My platform starts up a new container for each build and I keep loosing write permissions.

In the dat-sdk, is it possible to:

• access the secret key from the object returned from DatArchive.create
• set it as the secretKey option in DatArchive.load per https://github.com/mafintosh/hypercore#api

I was thinking of something like:

const myArchive = await DatArchive.create({
  title: 'My Archive'
})

const archive = await DatArchive.load(myArchive.url, {secretKey: myArchive.secretKey})

That way, I can set secretKey as an env variable, and maintain write permissions between containers.

[RangerMauve]

Would you be comfortable with an API like 'archive.getSecretKey()` which returns a promise?

cc @pfrazee since this might be a divergence from Beaker's API.

[pfrazee]

Sure go ahead

[RangerMauve]

Cool, I might get to it next week, but in the meantime a PR with a unit test would be very much welcome. It could look something like

async getSecretKey() {
await this._loadPromise
return this._archive.secretKey
}