[PR] ci(r): test cache-bin: false as #837 root-cause fix [draft, do not merge] [sedona-db]

["james-willis (via GitHub)" <gi...@apache.org>]

james-willis opened a new pull request, #841:
URL: https://github.com/apache/sedona-db/pull/841

   **This is an experimental PR to validate a hypothesis. Do not review or merge.**
   
   #838 fixed the macos-latest flake from #837 by adding a \`rustup toolchain install nightly --component rust-src\` step. The mechanism, as far as I can tell from CI logs, is unrelated to nightly itself:
   
   - The error in #837 (\`unexpected argument 'build' found\` from \`rustup-init\`) comes from the regular stable \`cargo build\` line in \`r/sedonadb/src/Makevars.in\`, not the wasm/nightly branch. Make echoes the entire \`if/then/else\` recipe as one line, which gave the misleading impression nightly was firing.
   - The configure script's \`cargo --version\` call reports \`rustup-init 1.29.0\` on failing runs, meaning the \`cargo\` on PATH is acting as the rustup installer rather than the toolchain proxy.
   - Failing runs all happened on cache-hit of \`Swatinem/rust-cache@v2\` with \`cache-bin: true\` (the default). My read: the cached \`~/.cargo/bin\` was saved on an older macos runner image generation and conflicts with the current one on restore.
   - After #838, the env hash that rust-cache uses changed (\`a124ad58\` → \`06097aa2\`) because the list of installed toolchains grew, evicting the bad cache. Post-#838 caches are healthy.
   
   This branch removes the nightly install and instead sets \`cache-bin: false\`, which prevents \`~/.cargo/bin\` from being cached at all.
   
   **Predicted outcome:** macos-latest passes consistently, no nightly toolchain required.
   
   If that holds, the follow-up PR is just this diff with a real commit message and #838 reverted. If it doesn't, my theory is wrong and #838 stays.
   
   Refs #837, #838.


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Re: [PR] ci: disable rust-cache cache-bin on macOS, add rustup-init guard (#837) [sedona-db]

["zhangfengcdt (via GitHub)" <gi...@apache.org>]

zhangfengcdt merged PR #841:
URL: https://github.com/apache/sedona-db/pull/841


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