How do I get `octopress deploy` to use the _config.yml that `jekyll build` uses?

[marcamillion]

I am using Octopress 3, and when I run jekyll build, it generates the correct set of files (which includes my static files, see list of files below):

      $ cd _site
:_site$ ls -a
.               CNAME               assets              google2d8.html  index-alternative.html
..              about               blog                increase-revenue.html       index.html

Note that my entire jekyll-generated blog is now safely stored within \blog\, which is how I want it.

But once I do octopress deploy, it basically overwrites this entire folder that overwrites my static files, see listing below:

      $ cd _site
:_site$ ls -a
.       ..      Gemfile     Gemfile.lock    about       css     feed.xml    index.html  jekyll

Here is my _config.yml:

title: My Title
email: some@email.com
description: > # this means to ignore newlines until "baseurl:"
     some description
baseurl: "/blog" # the subpath of your site, e.g. /blog
url: "http://example.com" # the base hostname & protocol for your site
twitter_username: myusername

source: '../'

# Build settings
markdown: kramdown
theme: minima

This is my _deploy.yml

method: git                 # How do you want to deploy? git, rsync or s3.
site_dir: _site             # Location of your static site files.
git_url: my_git_url

git_branch: gh-pages-2       # Git branch where static site files are commited

Note: Once I remove the following line from my _config.yml: source: '../', my jekyll build generates that deploy folder like octopress deploy does.

So I guess the real question is, once I customize _config.yml, how do I get octopress deploy to use that same jekyll _config.yml file?