move creation of ftp dir to post task
Moving step to create FTP directory from pre_tasks to post_tasks.
Otherwise on a fresh install the pipeline fails with the error:
TASK [galaxyproject.galaxy : Update Galaxy to specified ref] *******************
fatal: [192.168.103.118]: FAILED! => {"changed": false, "cmd": "/usr/bin/git clone --origin origin https://github.com/galaxyproject/galaxy.git /shared/mfs/data/galaxy/server", "msg": "fatal: destination path '/shared/mfs/data/galaxy/server' already exists and is not an empty directory.", "rc": 128, "stderr": "fatal: destination path '/shared/mfs/data/galaxy/server' already exists and is not an empty directory.\n", "stderr_lines": ["fatal: destination path '/shared/mfs/data/galaxy/server' already exists and is not an empty directory."], "stdout": "", "stdout_lines": []}