deb build: add postinst for libpcp-import2 /run/pmimport creation

[natoscott]

Fixes QA test 2007.

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Added post-installation setup for required temporary files when systemd-tmpfiles is available.
  • Installation now reports a warning if temporary-file setup fails while allowing the installation to complete successfully.

Walkthrough

The Debian package now installs a post-installation script. The script runs systemd-tmpfiles --create for libpcp_import.conf when available, warns on failure, and exits successfully.

Changes

Debian post-install integration

Layer / File(s)	Summary
Package post-installation wiring debian/GNUmakefile, debian/libpcp-import2.postinst	The package file list includes the post-installation script. The script conditionally runs systemd-tmpfiles --create for libpcp_import.conf, emits a warning on failure, and exits successfully.

Possibly related PRs

• performancecopilot/pcp#2656: Introduced the Debian libpcp-import2 packaging changes extended by this post-installation script.

Suggested reviewers: kmcdonell

Poem

A rabbit packs the Debian crate,
With tmpfiles ready at install state.
If systemd is near, the script will run,
A warning hops out if work is undone.
Then success brings the package home.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the Debian post-installation change and its purpose of creating /run/pmimport.
Description check	✅ Passed	The description states that the change fixes QA test 2007, which matches the pull request objective.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@debian/libpcp-import2.postinst`:
- Around line 9-14: Update the systemd-tmpfiles failure branch in the
post-install script to exit with status 1 after reporting the failure, instead
of continuing to the unconditional success exit. Preserve the existing warning
and successful path behavior.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Repository UI (inherited), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: 4083c7c9-c4bb-48b7-9dbd-0883ab7fc633

📥 Commits

Reviewing files that changed from the base of the PR and between 16dde5d and 86c77d0.

📒 Files selected for processing (2)

• debian/GNUmakefile
• debian/libpcp-import2.postinst