output repository has grown too large

[tfoote]

The results of this build go into https://github.com/ros-infrastructure/index.ros.org

I recently checked and that has grow to be 22GB since we have been running this job. That's unsustainably large. The checkout of the checkout itself is ~4B which is pushing the limits but isn't as critical.

To this end we need to take two actions.

• As an immediate triage we should rewrite the history of index.ros.org to remove the history and only have the latest state to reduce the size significantly.
• Secondly we should change the upload mechanism to not keep history. This may be as simple as changing the commit to --amend here and then enable force push in the GitPublisher The current config defaults it to off and it should be parameterized and only used for jobs like this with specific needs.

The current publisher snippet

<publishers>
<hudson.plugins.git.GitPublisher plugin="[email protected]">
<configVersion>2</configVersion>
<pushMerge>false</pushMerge>
<pushOnlyIfSuccess>true</pushOnlyIfSuccess>
<forcePush>false</forcePush>
<branchesToPush>
<hudson.plugins.git.GitPublisher_-BranchToPush>
<targetRepoName>origin</targetRepoName>
<branchName>gh-pages</branchName>
<rebaseBeforePush>false</rebaseBeforePush>
</hudson.plugins.git.GitPublisher_-BranchToPush>
</branchesToPush>
</hudson.plugins.git.GitPublisher>