Local extension to rails default layout generation

Is it possible to create a local extension to the layout generator
in rails to add the following lines of code to all layouts when
they are created?

I would like to accomplish this extension in such a fashion that it
survives future rails and ruby updates and is easily transportable
between systems. I suspect that a “plugin” is required, but my
knowledge of how rails works and of the ruby language in general is
at present too rudimentary to give any guidance as to where to
start.

Regards,
Jim


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