new: add pkh put, a native dput replacement for PPA uploads

Upload built source packages over SFTP with host-key verification
(Launchpad fingerprints pinned in host_keys.yml, ask-to-accept
otherwise), Launchpad account discovery (git config lp.user), and
pre-flight checks the upload queue itself never does: changes file
discovery/validation, PPA existence via the Launchpad API, target
series validity, and debian/control Section validity (sections
bundled in distro_info.yml). Upload log prevents duplicate uploads
unless --force.

distro_info.yml

@@ -15,6 +15,70 @@ dist:
       - updates
       - security
       - proposed-updates
+    sections:
+      # Valid Section values for debian/control: the Debian policy section
+      # list unioned with the sections observed in the live Ubuntu archive.
+      # Archives reject uploads carrying an unknown section; only the part
+      # before a '/' (the subsection) is validated.
+      - admin
+      - cli-mono
+      - comm
+      - database
+      - debian-installer
+      - debug
+      - devel
+      - doc
+      - editors
+      - education
+      - electronics
+      - embedded
+      - fonts
+      - games
+      - gnome
+      - gnu-r
+      - golang
+      - graphics
+      - hamradio
+      - haskell
+      - httpd
+      - interpreters
+      - introspection
+      - java
+      - javascript
+      - kde
+      - kernel
+      - libdevel
+      - libs
+      - lisp
+      - localization
+      - mail
+      - math
+      - metapackages
+      - misc
+      - net
+      - news
+      - ocaml
+      - oldlibs
+      - otherosfs
+      - perl
+      - php
+      - python
+      - ruby
+      - rust
+      - science
+      - shells
+      - sound
+      - tasks
+      - tex
+      - text
+      - translations
+      - utils
+      - vcs
+      - video
+      - web
+      - x11
+      - xfce
+      - zope
     series:
       local: /usr/share/distro-info/debian.csv
       network: https://salsa.debian.org/debian/distro-info-data/-/raw/main/debian.csv
@@ -25,6 +89,67 @@ dist:
       - updates
       - security
       - proposed
+    sections:
+      # Same list as debian (see the comment there)
+      - admin
+      - cli-mono
+      - comm
+      - database
+      - debian-installer
+      - debug
+      - devel
+      - doc
+      - editors
+      - education
+      - electronics
+      - embedded
+      - fonts
+      - games
+      - gnome
+      - gnu-r
+      - golang
+      - graphics
+      - hamradio
+      - haskell
+      - httpd
+      - interpreters
+      - introspection
+      - java
+      - javascript
+      - kde
+      - kernel
+      - libdevel
+      - libs
+      - lisp
+      - localization
+      - mail
+      - math
+      - metapackages
+      - misc
+      - net
+      - news
+      - ocaml
+      - oldlibs
+      - otherosfs
+      - perl
+      - php
+      - python
+      - ruby
+      - rust
+      - science
+      - shells
+      - sound
+      - tasks
+      - tex
+      - text
+      - translations
+      - utils
+      - vcs
+      - video
+      - web
+      - x11
+      - xfce
+      - zope
     series:
       local: /usr/share/distro-info/ubuntu.csv
       network: https://salsa.debian.org/debian/distro-info-data/-/raw/main/ubuntu.csv