feat: add package checksum tracking and re-extraction logic

[OliverTrautvetter]

Add the ability to download/install new builds of the same branch without cleaning up the oms-workdir first.

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[Copilot]

Pull request overview

This pull request adds package checksum tracking and automatic re-extraction logic to enable downloading and installing new builds of the same version/branch without manually cleaning up the oms-workdir first.

Changes:

• Implements checksum tracking using sidecar .md5 files alongside downloaded packages and marker files within extracted directories
• Adds automatic re-extraction logic when package checksums change, enabling seamless updates to new builds of the same version
• Maintains backward compatibility by gracefully handling cases where checksum files don't exist

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
internal/installer/package.go	Adds checksum comparison functions and modifies Extract() to automatically re-extract when package checksums change
internal/installer/package_test.go	Adds comprehensive test coverage for checksum tracking scenarios including checksum changes, missing markers, and backward compatibility
cli/cmd/download_package.go	Saves MD5 checksums to sidecar files after successful package download and verification
cli/cmd/download_package_test.go	Adds test to verify MD5 checksum sidecar file creation during package download

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[NautiluX]

Thanks for the PR, the whole file handling is a bit complicated and the extraction relies on the md5sum file being there, which means a user who deletes the md5sum file may run into problems (although users can always shoot themselves in the foot, of course).
See my comment, also happy to discuss in sync :)

[NautiluX]

I think you need to adjust it in the bootstrapping as well, I guess that part is missing tests? Probably we can abstract the package filename generation into a common function.

oms/internal/bootstrap/gcp/gcp.go

Line 1387 in 4db7095

installCmd := fmt.Sprintf("oms-cli install codesphere -c /etc/codesphere/config.yaml -k %s/age_key.txt -p %s-%s%s",

[NautiluX]

lgtm :)