Showcase the new Gerrit CI log archiving

Change-Id: I862f320d955216e26b226af15cf68ff748a0368d

sessions/gerrit-ci-forever.md

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+# Gerrit CI: How to keep logs forever on Jenkins
+
+We use Jenkins for verifying Gerrit patch sets under multiple
+configurations and conditions. The logfiles produced are a
+golden source of information. To keep Jenkins healthy and responsive,
+we needed to remove them all which sounded quite silly: would
+you just burn your cash because your wallet is too small?
+
+Using the Logstash plugin and correlating the logs with Gerrit
+review data I have managed to keep everything and *forever*
+enabling a much richer data analysis and materialize back
+the logs with the same URL referenced in the Gerrit changes.
+
+*[Luca Milanesio / Gerrit CI Build Engineer / GerritForge](../speakers.md#lmilanesio)*