Add config file class for C++ Conan `conanfile.txt`

What does this MR do and why?

Background

The Repository X-Ray is a tool that searches for dependency manager configuration files (aka "lock files") and then extracts a list of libraries from the content.

In #474306 (comment 2025085630), we decided to migrate the Repository X-Ray functionality into the GitLab Rails monolith. This gives us two main benefits: (i) it will eventually allow us to run the service outside of the CI pipeline, and (ii) we can maintain the parsing logic centrally so that other domains can utilize it.

Base MR

In !162313 (merged), we introduced the ConfigFiles::Base class where the intention is for each dependency manager config file type to be represented by a child class. The child class contains the parsing logic to extract a list of libraries and their versions from the file content.

This MR

In this MR, we introduce the CppConanTxt config file class that parses conanfile.txt.

For references to the existing parsing logic in the Repository X-Ray repo, see:

• https://gitlab.com/gitlab-org/code-creation/repository-x-ray/-/blob/6634564818dffdeac938014a190b0c604b1da6e0/internal/scanner/scanner.go#L399
• https://gitlab.com/gitlab-org/code-creation/repository-x-ray/-/blob/6634564818dffdeac938014a190b0c604b1da6e0/internal/deps/deps.go#L185

Resolves part of #476177 (closed).

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #476177 (closed)

changed milestone to %17.4

added Category:Code Suggestions Deliverable backend devopscreate feature flagskipped groupcode creation sectiondev typefeature workflowin dev labels

assigned to @lma-git

mentioned in issue #476177 (closed)

added 220 commits

• 095b70a0...777c72a7 - 219 commits from branch master
• b9fefbb5 - Add CPP Conan txt config file class

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changed the description

Hi @missy-gitlab! Could you please do the first backend review here? Please send it to any available maintainer if it looks okay to you. Thanks!

marked this merge request as ready

added workflowin review label and removed workflowin dev label

requested review from @missy-gitlab

approved this merge request

added pipeline:mr-approved label

added pipelinetier-2 label

requested review from @dmeshcharakou and removed review request for @missy-gitlab

added 1 commit

• bba2fe78 - Added an inline comment example

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E2E Test Result Summary

allure-report-publisher generated test report!

e2e-test-on-gdk: test report for bba2fe78

expand test summary

+------------------------------------------------------------------+
|                          suites summary                          |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| Create      | 128    | 0      | 16      | 0     | 144   | ✅     |
| Plan        | 74     | 0      | 1       | 0     | 75    | ✅     |
| Verify      | 44     | 0      | 2       | 0     | 46    | ✅     |
| Govern      | 72     | 0      | 0       | 0     | 72    | ✅     |
| Manage      | 1      | 0      | 1       | 0     | 2     | ✅     |
| Data Stores | 31     | 0      | 1       | 0     | 32    | ✅     |
| Release     | 5      | 0      | 0       | 0     | 5     | ✅     |
| Package     | 20     | 0      | 12      | 0     | 32    | ✅     |
| Secure      | 4      | 0      | 0       | 0     | 4     | ✅     |
| Monitor     | 8      | 0      | 0       | 0     | 8     | ✅     |
| Analytics   | 2      | 0      | 0       | 0     | 2     | ✅     |
| Fulfillment | 2      | 0      | 0       | 0     | 2     | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 391    | 0      | 33      | 0     | 424   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+

e2e-test-on-omnibus: test report for bba2fe78

expand test summary

+-------------------------------------------------------------+
|                       suites summary                        |
+--------+--------+--------+---------+-------+-------+--------+
|        | passed | failed | skipped | flaky | total | result |
+--------+--------+--------+---------+-------+-------+--------+
| Create | 551    | 0      | 68      | 0     | 619   | ✅     |
+--------+--------+--------+---------+-------+-------+--------+
| Total  | 551    | 0      | 68      | 0     | 619   | ✅     |
+--------+--------+--------+---------+-------+-------+--------+

approved this merge request

added pipelinetier-3 pipeline:run-e2e-omnibus-once labels and removed pipelinetier-2 label