fix tests

docs/ssh.md

@@ -0,0 +1,19 @@
+# SSH
+npmci allows easy usage of ssh:
+
+## Add the SSH KEY to the environment
+
+To make npmci aware of any SSH KEY add it to the environment in the following format
+```
+# Key
+NPMCI_SSHKEY_[A_NAME_FROM_YOU]
+# Value:
+[targeted host]|[privatekey as base64]|***
+```
+
+## Use npmci cli tool in your ci script
+```
+npmci prepare ssh
+npmci command git remote add heroku ssh://git@heroku.com/[you project name].git
+npmci command git push heroku master
+```