Workflow custom commands should be executed from the project directory by default

[fleroux514]

For instance, with this digger.yaml config:

projects:
  - name: proj_a_dev
    dir: ./proj_a/development
    workflow: my_workflow
  - name: proj_a_prod
    dir: ./proj_a/production
    workflow: my_workflow
workflows:
  my_workflow:
    plan:
      steps:
      - init
      - plan
      - run: pwd

I would expect pwd to return the path to ./proj_a/development and ./proj_a/production when executed from both projects respectively. Currently it returns the root repo path.

Need this functionality to run commands like checkov in all projects.

[Spartakovic]

#261