Bug 1172107 - Bump container version; r=ahal

This also changes the registry to point to quay.io/mrrrgn since djmitches account
is currently unavailable.

--HG--
extra : rebase_source : 4bffdaef2d9979702cdda81dcb555cc46e30e1b6

testing/docker/desktop-build/REGISTRY

@@ -1 +1 @@
-quay.io/djmitche
+quay.io/mrrrgn

testing/docker/desktop-build/VERSION

@@ -1 +1 @@
-0.0.17
+0.0.18