[Services] Allow for docker paths and system packages

Summary:
This allows for later diffs to not fail CI

This handles the existing and later workflows.

This work will be reverted later in https://phab.comm.dev/D4735

Depends on D4685

Test Plan: Blob, backup, and tunnelbroker CI gates pass

Reviewers: atul, abosh, max, karol

Reviewed By: abosh

Subscribers: ashoat, tomek, adrian

Differential Revision: https://phab.comm.dev/D4734