Windows shell executor does not clear build directory
The Windows shell executor does not clear the build directory when it is finished. Since pipelines for pull requests run under the fork and not the main repository, this ends up creating a separate copy of the code and build tree for each fork, quickly using up all the disk space on the runner. This then causes the runner to fall over and become unresponsive. I could make the disk bigger, but this does not really seem like a solution.