docs(installation): document GHCR pre-built image and unprivileged runtime

[jlucaso1]

Summary

Updates installation.mdx to reflect changes from whatsapp-rust#927.

• New "Pre-built image" subsection — documents ghcr.io/oxidezap/whatsapp-rust:latest, the multi-arch manifest (amd64/arm64 resolved automatically), tagged release images, and publish triggers.
• "Build the image" → "Build from source" — renamed to make clear it's now an alternative to pulling.
• Updated "Run the container" — switches example commands to use the GHCR image reference and a named volume (whatsapp-data:/data). Named volumes are now recommended because the container runs as uid 65532 and a named volume inherits that ownership automatically; host bind mounts require manual chown.
• Host bind-mount note — explains the uid 65532 ownership requirement for users who prefer bind mounts.
• Upgrade path — one-time chown command for existing volumes that were created under the old root-running image.

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Generated by Claude Code

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Summary by cubic

Add docs for the pre-built multi-arch Docker image on GHCR and the unprivileged runtime (uid 65532). Examples now pull ghcr.io/oxidezap/whatsapp-rust:latest, prefer a named volume for /data, rename “Build from source,” and include bind-mount guidance.

• Migration
  • Upgrading from older root-based images? Fix existing named volumes once: docker run --rm -v whatsapp-data:/data alpine chown -R 65532:65532 /data

^{Written for commit 53c73d0. Summary will update on new commits.}

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Project	Status	Preview	Updated (UTC)
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[chatgpt-codex-connector]

Don't point Docker users at an unpublished image

This new pre-built-image path is currently not pullable: the public oxidezap package list shows no container package for whatsapp-rust, so users following this command will get a GHCR not-found/authorization error instead of an installable image. Please either publish and make the GHCR package public before merging these docs, or frame this as a future/after-publish reference rather than the primary Docker install path.

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