Introduce `WP_CLI_SSH_PRE_CMD` for users to set up env as needed
Introduce `WP_CLI_SSH_PRE_CMD` for users to set up env as needed

```
WP_CLI::add_hook( 'before_ssh', function() {
	if ( $ssh = WP_CLI::get_runner()->config['ssh'] ) {
		list( $host, $path ) = explode( ':', $ssh );
		switch( $host ) {
			case 'hb':
				putenv( 'WP_CLI_SSH_PRE_CMD=export PATH=$HOME/bin:$PATH' );
				break;
		}
	}
});
```

nyordanov/wp-cli,GaryJones/wp-cli,aaemnnosttv/wp-cli,aaemnnosttv/wp-cli,gitlost/wp-cli,miya0001/wp-cli,rodrigoprimo/wp-cli,rodrigoprimo/wp-cli,aaemnnosttv/wp-cli,2ndkauboy/wp-cli,2ndkauboy/wp-cli,gitlost/wp-cli,trepmal/wp-cli,rodrigoprimo/wp-cli,2ndkauboy/wp-cli,miya0001/wp-cli,nyordanov/wp-cli,trepmal/wp-cli,miya0001/wp-cli,gitlost/wp-cli,nyordanov/wp-cli,GaryJones/wp-cli,trepmal/wp-cli,GaryJones/wp-cli