Fix creation of zip packages in Windows

[jsoriano]

Package Registry was using the OS-native relative paths directly when building zip packages. On windows this was using back slashes, but names in zip headers are expected to use forward slashes.

Tests were passing only because the paths were converted when reading the zip.

[prodsecmachine]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues

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[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: b27b741

History

• 💔 Build #1522 failed 54e3536

cc @jsoriano