Merge pull request #326 from pbx0/readme

explain PR tests commands

Author: aaronlevy

README.md

@@ -78,6 +78,13 @@ make install
 ### Development
 Running `make run-single` or `make run-multi` resets the single-node or multi-node Vagrant environments, respectively, in the background while compiling bootkube and provisions the fresh VM with bootkube when compilation is complete. This is intended to speed up iteration.
 
+## Running PR Tests
+The basic test suite should run automatically on PRs. It can be re-run by commenting to the PR: `rktbot run tests`. To whitelist an external contributor's PR temporarily, one can use the `ok to test` command.
+
+More extensive self-hosted etcd testing can be run by commenting: `rktbot run etcd tests`. The maintainers will be responsible for determining if this is needed and should pass as it may contain experimental or flaky tests.
+
+If changes are made to the checkpointer code you must run a third type of test: `rktbot run checkpointer tests`
+
 ## Conformance Tests
 
 This repository includes scripts for running the Kubernetes conformance tests agains the [hack/single-node](hack/single-node) and [hack/multi-node](hack/multi-node) launched clusters.