Backport darwin (amd64/arm64) kubectl-volsync support to release-0.15

[qjoly]

Summary

This PR backports darwin support for the kubectl-volsync krew plugin to the release-0.15 branch.

The same changes were merged to main via PR #1933 and PR #2001, but they landed 4 hours after the v0.15.0 release was published, leaving darwin users unable to install the plugin.

Changes

• .github/workflows/release.yml: adds GOOS: [linux, darwin] to the matrix, creating 4 build jobs (linux+darwin × amd64+arm64); darwin builds use make krew-plugin-manifest to produce the tarball; upload step uses per-platform filenames (kubectl-volsync-$GOOS-$ARCH.tar.gz)
• .krew.yaml: adds darwin/amd64 and darwin/arm64 platform entries using {{addURIAndSha}} so krew-release-bot computes the correct sha256 for each tarball
• kubectl-volsync/volsync.yaml: adds darwin platform entries and fixes linux URIs to the per-arch filename format, allowing make test-krew to work on macOS

Testing

On the next patch release (v0.15.x), the CI will produce:

• kubectl-volsync-linux-amd64.tar.gz
• kubectl-volsync-linux-arm64.tar.gz
• kubectl-volsync-darwin-amd64.tar.gz
• kubectl-volsync-darwin-arm64.tar.gz

krew-release-bot will then open a PR to krew-index with all four platforms.

Fixes: darwin users getting No platform available for darwin/arm64 or darwin/amd64 when running kubectl krew install volsync.

[openshift-ci]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[tesshuflower]

We're actually working on trying to get a pre-release of v0.16.0 out now, to test the actual darwin kubectl binary workflow, which has failed a couple times - I don't think we have any plans of doing a .z v0.15 release.