This allows any binary package in src:freedombox to be upgraded from
backports, so that packaged manuals are included.
Thanks for Frank Woodward for finding the root cause and solution.
Tests:
- Build a FreedomBox bullseye image with backports disabled.
- During setup, enable backports, and update packages. freedombox
package from bullseye-backports is installed, but freedombox-doc-*
packages are from bullseye.
- Install freedombox package with the fix, and update
packages. freedombox-doc-* packages from bullseye-backports are
installed.
Closes#2106.
Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
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