Always clean build environment in CI
Also allow one re-run of build jobs by default on failure, and change default of 2 tries to 1 for tests.
Also adds individual CCACHE directories for jobs
Change-Id: I24550d8f31bb8edba5d4d29401f6c34d0baf2cf5
Also allow one re-run of build jobs by default on failure, and change default of 2 tries to 1 for tests.
Also adds individual CCACHE directories for jobs
Change-Id: I24550d8f31bb8edba5d4d29401f6c34d0baf2cf5