propellor/doc/todo/multi_gpg_key_privdata.mdwn

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To support multiple gpg keys added with --add-key, propellor should
* When it encrypts the privdata after a change, encrypt it to all keys
listed in `privdata/keyring.gpg`. See [this
post](http://laurent.bachelier.name/2013/03/gpg-encryption-to-multiple-recipients/)
explaining why and how encryption with multiple recipients work.
* When --add-key adds a new key, it should re-encrypt the privdata,
so that this new key can access it.
* When --add-key on behalf of another user, do not modify the signing key for
local git. This entails either splitting this command in two, `--add-key` and
`--set-signing-key`, or adding another command `--add-foreign-key`,
or perhaps determining if the key being added has a known secret key.
[[done]]