Import Debian version 1.30

sgml-base (1.30) unstable; urgency=medium

  * QA upload.
  * debian/control:
      - Added 'Rules-Requires-Root: no' to source stanza.
      - Bumped Standards-Version to 4.5.0.
  * debian/copyright: updated packaging copyright years.
  * debian/salsa-ci.yml: added to provide CI tests for Salsa.
  * debian/tests/control: created to perform trivial CI tests.

sgml-base (1.29.1) unstable; urgency=medium

  * QA upload.
  * Clean-up QA upload with no substantive changes.
  * debian/control:
    + Bump Standards-Version to 4.4.1.
    + Bump debhelper compat to v12.
    + Add Vcs-* fields to indicate git packaging repo under Salsa
      Debian group.
  * debian/copyright: Use secure URI.