title: git add . error: insufficient permission for adding an object to repository database .git/objects
body: <p>I am trying to push a Ruby on Rails repo to github, and just today it is giving me the following error:</p>
  
  <pre><code>******-*********:myapp *************$ git add .
  error: insufficient permission for adding an object to repository database .git/objects
  error: test/helpers/sessions_helper_test.rb: failed to insert into database
  error: unable to index file test/helpers/sessions_helper_test.rb
  fatal: adding files failed
  </code></pre>
  
  <p>This has just started occurring (things were working fine yesterday).  What could have changed and how do I solve this?  Thank you. </p>