dep8 tests fail in the presence of an HTTP proxy

[Pushkar Kulkarni]

[ Impact ]
* The merge proposal related [1] fixed the autopkgtest failures, but only for local testing. For the dep8 testing on autopkgtest.ubuntu.com, the tests continue to fail due to 403 errors [2] due to interference of a proxy. This blocks the migration of puppetdb on noble and oracular.

[ Test Plan ]
* Requesting autopkgtests on autopkgtest.ubuntu.com for noble and oracular reveals the failures [2].

[ Where problems could occur ]
* Currently, both tests under debian/test fail on oracular and noble [2].

The failures may be locally reproduced by enabling the squid proxy.For example, I used an internal proxy to reproduce the reported failures locally:

autopkgtest puppetdb \
  --env='http_proxy=http://<redacted-url>:<redacted-port-number>' \
  --apt-pocket=proposed=src:puppetdb -U \
  -- lxd autopkgtest/ubuntu/noble/amd64

[1] https://bugs.launchpad.net/ubuntu/+source/puppetdb/+bug/2072516
[2] https://bugs.launchpad.net/ubuntu/+source/puppetdb/+bug/2072516/comments/6

[Pushkar Kulkarni (pushkarnk)]

Adding plucky as an affected release.

[Ural Tunaboyu (uralt)]

Ubuntu 24.10 (Oracular Oriole) has reached end of life, so this bug will not be fixed for that specific release.