Monty Taylor b217e38904 Add backports repos to base and builder images
These don't install anything by default, but allow people
to easily opt-in to a backport package if they need to without
lots of extra lines of boilerplate.

The base python image is on bullseye now instead of buster. That
means the libffi version is 7 not 6.

Change-Id: I0e0c2669d838fb622422f696f73e96e409157270
2021-08-26 11:58:59 -05:00
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