fix(images): unblock ci-buildkit (tar layout) + ci-rust (zig 0.13.0)

Andrew Dunnrequested to merge
fix/rc3-buildkit-zig into main

Two more rc.3 fixes:

  • ci-buildkit: --strip-components=1 put buildctl at /usr/local/buildctl instead of /usr/local/bin/buildctl; exit 127. Drop strip-components.
  • ci-rust: Zig 0.14+ changed download naming convention. Pin to 0.13.0 (well-known cargo-zigbuild baseline); reconsider 0.14+ with corrected URL in a follow-up.

After merge, cut v2.0.0-rc.4.

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