"add-to-output-repos.sh" is broken

[Turbo87]

While I was trying to publish a stable release (v2.11.1) I saw the following during ./dev/add-to-output-repos.sh:

$ ./dev/add-to-output-repos.sh
Cloning into 'ember-new-output'...
remote: Counting objects: 536, done.
remote: Compressing objects: 100% (2/2), done.
remote: Total 536 (delta 0), reused 0 (delta 0), pack-reused 534
Receiving objects: 100% (536/536), 66.88 KiB | 0 bytes/s, done.
Resolving deltas: 100% (361/361), done.
~/Code/ember-cli/tmp/ember-new-output ~/Code/ember-cli/tmp
rm '.bowerrc'
rm '.editorconfig'
rm '.ember-cli'
rm '.gitignore'
rm '.jshintrc'
rm '.travis.yml'
rm '.watchmanconfig'
rm 'README.md'
rm 'app/app.js'
rm 'app/components/.gitkeep'
rm 'app/controllers/.gitkeep'
rm 'app/helpers/.gitkeep'
rm 'app/index.html'
rm 'app/models/.gitkeep'
rm 'app/resolver.js'
rm 'app/router.js'
rm 'app/routes/.gitkeep'
rm 'app/styles/app.css'
rm 'app/templates/application.hbs'
rm 'app/templates/components/.gitkeep'
rm 'bower.json'
rm 'config/environment.js'
rm 'ember-cli-build.js'
rm 'package.json'
rm 'public/crossdomain.xml'
rm 'public/robots.txt'
rm 'testem.js'
rm 'tests/.jshintrc'
rm 'tests/helpers/destroy-app.js'
rm 'tests/helpers/module-for-acceptance.js'
rm 'tests/helpers/resolver.js'
rm 'tests/helpers/start-app.js'
rm 'tests/index.html'
rm 'tests/integration/.gitkeep'
rm 'tests/test-helper.js'
rm 'tests/unit/.gitkeep'
rm 'vendor/.gitkeep'
installing app
  create .bowerrc
  create .editorconfig
  create .ember-cli
  create .jshintrc
  create .travis.yml
  create .watchmanconfig
  create README.md
  create app/app.js
  create app/components/.gitkeep
  create app/controllers/.gitkeep
  create app/helpers/.gitkeep
  create app/index.html
  create app/models/.gitkeep
  create app/resolver.js
  create app/router.js
  create app/routes/.gitkeep
  create app/styles/app.css
  create app/templates/application.hbs
  create app/templates/components/.gitkeep
  create bower.json
  create config/environment.js
  create ember-cli-build.js
  create .gitignore
  create package.json
  create public/crossdomain.xml
  create public/robots.txt
  create testem.js
  create tests/.jshintrc
  create tests/helpers/destroy-app.js
  create tests/helpers/module-for-acceptance.js
  create tests/helpers/resolver.js
  create tests/helpers/start-app.js
  create tests/index.html
  create tests/integration/.gitkeep
  create tests/test-helper.js
  create tests/unit/.gitkeep
  create vendor/.gitkeep
error: branch 'master' not found.
D	.bowerrc
D	.editorconfig
D	.ember-cli
D	.gitignore
D	.jshintrc
D	.travis.yml
D	.watchmanconfig
D	README.md
D	app/app.js
D	app/components/.gitkeep
D	app/controllers/.gitkeep
D	app/helpers/.gitkeep
D	app/index.html
D	app/models/.gitkeep
D	app/resolver.js
D	app/router.js
D	app/routes/.gitkeep
D	app/styles/app.css
D	app/templates/application.hbs
D	app/templates/components/.gitkeep
D	bower.json
D	config/environment.js
D	ember-cli-build.js
D	package.json
D	public/crossdomain.xml
D	public/robots.txt
D	testem.js
D	tests/.jshintrc
D	tests/helpers/destroy-app.js
D	tests/helpers/module-for-acceptance.js
D	tests/helpers/resolver.js
D	tests/helpers/start-app.js
D	tests/index.html
D	tests/integration/.gitkeep
D	tests/test-helper.js
D	tests/unit/.gitkeep
D	vendor/.gitkeep
Switched to branch 'master'
[master 1be5baf] 2.11.1
 1 file changed, 3 insertions(+), 3 deletions(-)
fatal: The current branch master has no upstream branch.
To push the current branch and set the remote as upstream, use

    git push --set-upstream origin master

Counting objects: 3, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 307 bytes | 0 bytes/s, done.
Total 3 (delta 2), reused 0 (delta 0)
remote: Resolving deltas: 100% (2/2), completed with 2 local objects.
To github.com:ember-cli/ember-new-output.git
 * [new tag]         v2.11.1 -> v2.11.1

and to highlight the important bit:

fatal: The current branch master has no upstream branch.

which means that the tag was pushed correctly, but the branch was not.

/cc @kellyselden @rwjblue @stefanpenner

[kellyselden]

I shall take this on.

[locks]

Is this still relevant?