feat: add libc2pa Linux .deb and .rpm package builds

[gpeacock]

Add a CI step to library-release.yml that produces libc2pa (runtime) and libc2pa-dev (headers + pkg-config) packages in both .deb and .rpm formats for x86_64 and aarch64 Linux targets using fpm.
This is pretty standard practice on linux platforms and will allow the library to be installed via apt or yum

[codspeed-hq]

Merging this PR will improve performance by ×3.8

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 6 improved benchmarks
✅ 24 untouched benchmarks
⏩ 64 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	update-manifests/read	43.6 MB	5.6 MB	×7.8
⚡	Memory	binary-ingredient-tree/read	50.8 MB	15.3 MB	×3.3
⚡	Memory	deep-ingredients/read	45.1 MB	4.7 MB	×9.7
⚡	Simulation	binary-ingredient-tree/read	1,071.9 ms	773 ms	+38.66%
⚡	Simulation	update-manifests/read	815.4 ms	289.6 ms	×2.8
⚡	Simulation	deep-ingredients/read	834.5 ms	278 ms	×3

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing gpeacock/library_packages (aa1fee2) with main (9fb5ef4)²}

Footnotes

1. 64 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (6feef8f) during the generation of this report, so 9fb5ef4 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.47%. Comparing base (6feef8f) to head (aa1fee2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2041   +/-   ##
=======================================
  Coverage   78.47%   78.47%           
=======================================
  Files         177      177           
  Lines       45391    45391           
=======================================
  Hits        35620    35620           
  Misses       9771     9771           

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[ok-nick]

Approving given the workflows were verified to work.