Idea: make use of subshells to encapsulate working directory changes

[dreadwarrior]

While using the deb deploy method, it's sometimes not obvious where your are when using the provided hooks. Subshells could help a lot and we can ensure the user is landing in a well defined directory context while using hooks.

E.g.

  # do something in current dir
  (cd /some/other/dir && other-command)
  # continue in original dir