deb: add docker-compose-plugin as "recommends"

This adds a "weak" dependency on the docker-compose-plugin, per the
recommendations in https://debian-handbook.info/browse/stable/sect.package-meta-information.html#id-1.8.6.7.10.10

The "recommends" dependency will be installed by default, but does allow users to opt-out
using `--no-install-recommends` to perform a lightweight installation for setups that only
need basic functionality of docker;

> (...) the “recommended” dependencies, the most important, considerably improve
> the functionality offered by the package but are not indispensable to its operation.
> (...) You should always install the “recommended” packages, unless you know exactly
> why you do not need them. This is now also the default for APT unless configured
> otherwise.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

deb/common/control

@@ -63,7 +63,8 @@ Package: docker-ce-cli
 Architecture: linux-any
 Depends: ${shlibs:Depends}
 # TODO change once we support scan-plugin on other architectures
-Recommends: docker-scan-plugin [amd64]
+Recommends: docker-compose-plugin,
+            docker-scan-plugin [amd64]
 Conflicts: docker (<< 1.5~),
            docker-engine,
            docker-engine-cs,