[Feature] Support repos in run configurations (and make dstack init optional)

1. Introduce the repos property (similar to files)

repos:
  - .:/workflow

or

repos:
  - .

or

repos:
  - repo_path:  .
     path: .
     identity_key: ~/.ssh/id_rsa

or

repos:
  - repo_path:  .
    identity_key: ~/.ssh/id_rsa

or

repos:
  - repo_path:  .
    token: {env. GH_TOKEN}

Note, if the repo is remote, dstack will try to use the default Git credentials (as it does now) using ~/.config/gh/hosts.yml or ~/.ssh/id_rsa.

A repo path can be also a GitHub URL (as it's supported now):

repos:
  - repo_path:  https://github.com/huggingface/open-r1

or

repos:
  - https://github.com/huggingface/open-r1:/workflow

2. Introduce ssh_config.identity_file
3. Deprecate dstack init

Warning

For the first version, let's allow up to one repo. Should help limit changes while addressing the main UX issue.

Add declarative repo configuration

Add `repos[].path` property

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