The bamboo workflow is:

checkout resource from git

{bamboo.build.dir}/workspace
fetch target in {bamboo.build.dir}

/targetPlatform
clean

{bamboo.build.dir}

/buckminster.output
build Ergo

Since bamboo reuses jobs, there may already be a targetPlatform directory containing target pieces. When the target gets updated, the next time a job runs, the fetch target will pull down the new target to the existing targetPlatform directory. This can cause build issues. Since we are simply copying the target from a target build on the system, we should add a step in the workflow to clean out the target folder every time.