Add an howto clean the side-tags created by monitor-gating

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

clean_monitoring_sidetags.md

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+# How to clean up the side-tags created by the monitor-gating project?
+
+Monitor-gating runs in openshift and monitors the packager workflow end to end.
+Doing this for single build and multi-builds updates by gettings few tests
+packages go through that workflow.
+
+If something happens and side-tags accumulates in koji, they can be cleaned 
+using the following steps:
+
+* Go to openshift
+  https://os.fedoraproject.org/console/project/monitor-gating/overview
+  (this links points directly to the monitor-gating project)
+
+* Access the running pod
+
+* Click on the "Terminal" tab to have a shell in that pod
+
+* Run the following command:
+
+  python3 /opt/code/clean_up_side_tags.py /opt/config/runner.cfg 
+
+It will go through all the side-tags created by this user/keytab and delete
+them using fedpkg remove-side-tag. It will do this for all but one (which may be
+in use by the script when the command is ran).