You can use this build pack to set multiple SSH aliases in your ~/.ssh/config file. This is particularly useful to download a composer dependency stored in a private repository using deploy keys.
The buildpack takes environment variables, creates a SSH Config file, and adds each alias to a list of known hosts.
Add the buildpack to your application using the Heroku dashboard, or:
$ heroku buildpacks:set --index 1 https://github.com/scottcharlesworth/ssh-alias-key-buildpack
It needs to be run before any other buildpack that may need SSH access.
Next you will need to set the following environment variables:
SSH_ALIAS- a comma separated list of aliases
SSH_HOST- a comma separated list of hostnames
SSH_USER- a comma separated list of users
Each item in the above must be in the same order. In addition there must also be a key value, encoded in base64 format:
SSH_KEY_#- (starting from 0) a key for each alias
The buildpack will check to make sure there are an equal number of aliases, hosts, users, and keys - and will not process the variables if there is a different number.
Copy the snippet above into CLI.