[FLOC-4556] Avoid putting root owned files into the checked out repository

[wallrj]

Fixes: https://clusterhq.atlassian.net/browse/FLOC-4556

Don't put package files in the repository. Put them straight into /var/html instead.

I've also put the package repo in directory that should only exist for a single build.

$TRIGGERED_BRANCH/$BUILD_TAG

• https://wiki.jenkins-ci.org/display/JENKINS/Building+a+software+project#Buildingasoftwareproject-JenkinsSetEnvironmentVariables

There are a bunch of acceptance test failures caused by failure to cleanup Docker containers after the integration tests. I dug into the logs and found signs of this known Docker issue: https://github.com/docker/docker/issues/27381