Bug#1108998: dpkg-dev: Please recognise the `Commands` field in debs

Package: dpkg
Version: 1.22.20
Severity: wishlist
X-Debbugs-Cc: [email protected]

Per #638517, we would like to add a `Commands` field to the `.deb`'s 
control file to support the "command-not-found" feature.

Ideally, `dpkg-gencontrol` would allow substitution variables in it. 
Optimally, `dpkg-gencontrol` would also optimize the field similar to 
what it does with `Depends` in case values are repeated (`Commands` can 
use a simpler merging since it is only basenames and not full blown 
dependency clause).

But for starters, just having `dpkg-gencontrol` not warn about the field 
and replacing substvars would be a great start for post-trixie.

Best regards,
Niels

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