closes #5289
* +linkerd.io/linkerd2 * +linkerd.io/linkerd2 -- build directly * Revert "+linkerd.io/linkerd2 -- build directly" This reverts commit 342257cd1388348255620324c9dfd7e07b2dddc7. * +linkerd.io/linkerd2 -- fix platform variable; add CI_FORCE_CLEAN