dosbox-staging: Persist drives folder

[farsil]

Closes #15223
Closes #14794

This PR adds the drives folder to the persist list of dosbox-staging, version 0.82.0. This is to enable persistence for the drives used in the automount feature, described in the default configuration file:

#                   automount: Mount 'drives/[c]' directories as drives on startup, where [c] is a lower-case
#                              drive letter from 'a' to 'y' (enabled by default). The 'drives' folder can be
#                              provided relative to the current directory or via built-in resources.
#                              Mount settings can be optionally provided using a [c].conf file along-side
#                              the drive's directory, with content as follows:
#                                [drive]
#                                type    = dir, overlay, floppy, or cdrom
#                                label   = custom_label
#                                path    = path-specification, ie: path = %%path%%;c:\tools
#                                override_drive = mount the directory to this drive instead (default empty)
#                                verbose = true or false

• Use conventional PR title: <manifest-name[@version]|chore>: <general summary of the pull request>
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Summary by CodeRabbit

• Chores
  • Updated persistence configuration to ensure the drives directory is retained across runs and upgrades.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1296b0ad-fabe-4c81-a777-7ab8077b8a59

📥 Commits

Reviewing files that changed from the base of the PR and between 7f62e04 and 03a8c5a.

📒 Files selected for processing (1)

• bucket/dosbox-staging.json

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Walkthrough

Updated the bucket manifest for dosbox-staging to persist the drives directory across runs and upgrades, ensuring auto-mounted drives are retained alongside other persisted configuration and resource files.

Changes

Cohort / File(s)	Summary
Bucket Manifest Configuration bucket/dosbox-staging.json	Added "drives" to the persist list to enable persistence of auto-mounted drive directories across installations and updates.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

Poem

🐰 A single line, so clean and small,
Drives persist through it all!
No more mounting lost to time,
Auto-folders now sublime. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding persistence for the 'drives' folder in dosbox-staging, which directly corresponds to the file modification.
Description check	✅ Passed	The description provides comprehensive context, explains the rationale for the change, references related issues/discussions, includes the configuration documentation, and confirms completion of the contribution checklist.
Linked Issues check	✅ Passed	The PR fully addresses issue #14794 by implementing option 2 (persist 'drives') as requested, enabling persistence for auto-mounted drives regardless of working directory.
Out of Scope Changes check	✅ Passed	The sole change is adding 'drives' to the persist list in dosbox-staging.json, which is directly aligned with the linked issue's requirements and contains no out-of-scope modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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