publish ruby image on merge
publish ruby image on merge

flag = none

Test Plan:
-Jenkins passes, on merge the ruby image is published

Change-Id: Ie6bf57569c2a041fad24fd62f4e73a8d6abe23f3
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/242716
Reviewed-by: Ryan Norton <65299b45178f94900ff304765e8fbf07bd13b331@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: James Butters <4c5a489c9bb72d41f20b3b22aaf4c9b864e32f20@instructure.com>
Product-Review: James Butters <4c5a489c9bb72d41f20b3b22aaf4c9b864e32f20@instructure.com>

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