Lintian tag information: maintainer-script-should-not-use-piuparts-variable (type: warning)

Description (from lintian-explain-tags)

The maintainer script appears to reference one of the PIUPARTS_* variables
such as PIUPARTS_TEST or PIUPARTS_PHASE.

These variables are intended to be used by custom piuparts(1) scripts and
not by maintainer scripts themselves.

Please remove the references to this variable.

Please refer to the piuparts(1) manual page and
https://piuparts.debian.org/doc/README.html for details.

Visibility: warning
Show-Always: no
Check: scripts

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