fix(mcv): switch to vfs storage and remove fuse-overlayfs dependencies

[cmagina]

VFS storage driver avoids nested overlay-on-overlay issues when running buildah inside containers. Remove fuse-overlayfs/fuse3 packages as they are only needed for overlay storage driver.

Resolves "mkdir /io.triton.manifest: operation not permitted" errors when running MCV in Docker/Podman environments (common on Fedora where docker is podman).

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 46f03eaf-74df-4173-abf9-a21a532c5d85

📥 Commits

Reviewing files that changed from the base of the PR and between 135a404 and ecaa35d.

📒 Files selected for processing (1)

• mcv/images/Containerfile

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Updated container storage configuration for improved compatibility and reliability.
  • Removed obsolete FUSE-related package requirements from container targets.

Walkthrough

The container targets remove FUSE storage dependencies and change container storage configuration from overlay with fuse-overlayfs to the vfs driver.

Changes

Container storage configuration

Layer / File(s)	Summary
Replace FUSE-based storage configuration mcv/images/Containerfile	The minimal, NVIDIA, and unified targets remove fuse-overlayfs and fuse3. Their storage configuration uses the vfs driver without a mount_program setting.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to ecaa3

The PR switches MCV image storage to VFS and removes unnecessary fuse packages; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: maryamtahhan, billy99

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the switch to VFS storage and removal of obsolete dependencies.
Description check	✅ Passed	The description explains the VFS change, dependency removal, and the container runtime error it resolves.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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