SSH task not compatible with ssh/config file

Issue Summary

When setting AcceptEnv in ~/.ssh/config, Bamboo doesn't apply the settings there. This happens because Bamboo doesn't call the OS native SSH client, but uses a built-in plugin

Steps to Reproduce

1. Create a file in the users profile:

   touch ~/.ssh/config
   chmod 600 config
   

1. Set a rule, like for example:

   Host *
      SendEnv bamboo*
   

1. In the remote server, set /etc/ssh/sshd_config to accept those variables:

   ...
   # Allow client to pass locale environment variables
   AcceptEnv bamboo*
   AcceptEnv LANG LC_*
   ...
   

1. In a build, set a variable:

   var = value1
   

1. Create a SSH task and use the variable:

   echo ${bamboo_var}
   

Expected Results

Value is printed

Actual Results

Value is not printed. This is also reproducible by defining the variable on a script task:

export bamboo1=value1

Similar tests run from command line (same computer + OS user) work normally (those same variables can be echoed).

Workaround

Use a script task instead.