ci(query-regression): derive the Rust toolchain pin from rust-toolchain.toml

Replace the hard-coded RUSTUP_TOOLCHAIN value and the hard-coded
version strings in the runner Verify assertions with a pin resolved
from rust-toolchain.toml:

- the always-running test-tooling job exports the channel parsed from
  rust-toolchain.toml as a job output
- query-regression sets RUSTUP_TOOLCHAIN from that output
- the Verify step escapes the pin into the cargo/rustc/active-toolchain
  regexes at runtime; the exact commit hash and date are asserted
  generically since a stable version identifies the release

Removing the redundant require_eq (workflow yaml vs runner env) since
both now flow from the single source of truth. When rust-toolchain.toml
is bumped, the run fails with a clear signal until the runner image is
rebuilt with the new toolchain, keeping the existing lockstep contract.

Part of #9289.

Signed-off-by: Ning Sun <sunning@greptime.com>

.github/runner-scale-sets/query-regression/README.md

@@ -158,7 +158,8 @@ overridable via `QUERY_REGRESSION_RUNNER_UID`/`QUERY_REGRESSION_RUNNER_GID`)
 and exact tool versions: `libprotoc 3.21.12`, `uv 0.11.26`, `mold 2.40.4`,
 `Python 3.14.4`, `sccache 0.16.0`, `otelgen` commit
 `863a3f395d062c7322cc1de08a38774b7fdaa6c8`, root-owned `rustup 1.29.0`, and
-the image-baked `1.96.1` Rust toolchain. `mold` and `python3`
+the image-baked Rust toolchain matching the pin resolved from
+`rust-toolchain.toml` (asserted dynamically by the workflow). `mold` and `python3`
 come from apt at image-build time (not Ubuntu 24.04's default 3.12); bump
 the Verify pins together with `QUERY_REGRESSION_ECS_IMAGE_ID` when the
 image is rebuilt. Rustup, Cargo, and Rustc

.github/workflows/query-regression.yml

@@ -120,12 +120,23 @@ jobs:
     # Ordinary PRs also run the same tests from checks.yml.
     runs-on: ubuntu-latest
     timeout-minutes: 10
+    outputs:
+      # The Rust toolchain pin, resolved from rust-toolchain.toml so the
+      # benchmark always runs the workspace toolchain without a second
+      # hard-coded copy in this workflow.
+      rust_toolchain: ${{ steps.rust-toolchain.outputs.pin }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
         with:
           persist-credentials: false
 
+      - name: Resolve Rust toolchain pin
+        id: rust-toolchain
+        run: |
+          pin="$(grep -E '^channel' rust-toolchain.toml | cut -d'"' -f2)"
+          echo "pin=${pin}" >> "$GITHUB_OUTPUT"
+
       - name: Test query regression tooling
         run: |
           python3 tests/perf/test_query_regression_runner_compaction_toctou.py
@@ -190,7 +201,7 @@ jobs:
       CARGO_HOME: /home/runner/.cargo
       UV_CACHE_DIR: /home/runner/.cargo/uv-cache
       RUSTUP_HOME: /opt/rustup
-      RUSTUP_TOOLCHAIN: 1.96.1
+      RUSTUP_TOOLCHAIN: ${{ needs.test-tooling.outputs.rust_toolchain }}
       RUSTUP_AUTO_INSTALL: "0"
       CARGO_TARGET_DIR: /home/runner/query-regression-target
       QUERY_REGRESSION_CACHE_META: /home/runner/query-regression-cache-meta
@@ -504,14 +515,16 @@ jobs:
           require_eq cargo_path "$(command -v cargo || true)" "/opt/cargo/bin/cargo"
           require_eq rustc_path "$(command -v rustc || true)" "/opt/cargo/bin/rustc"
           require_match rustup "$(capture rustup --version)" '^rustup[[:space:]]1\.29\.0([[:space:]]|$)'
+          # The toolchain pin flows from rust-toolchain.toml (resolved in the
+          # test-tooling job); escape it for the regex assertions below.
+          pin_regex="${RUSTUP_TOOLCHAIN//./\\.}"
           require_match cargo "$(capture cargo --version)" \
-            '^cargo[[:space:]]1\.96\.1[[:space:]]\(356927216[[:space:]][0-9]{4}-[0-9]{2}-[0-9]{2}\)$'
+            "^cargo[[:space:]]${pin_regex}[[:space:]]\([0-9a-f]+[[:space:]][0-9]{4}-[0-9]{2}-[0-9]{2}\)$"
           require_match rustc "$(capture rustc --version)" \
-            '^rustc[[:space:]]1\.96\.1[[:space:]]\(31fca3adb[[:space:]][0-9]{4}-[0-9]{2}-[0-9]{2}\)$'
+            "^rustc[[:space:]]${pin_regex}[[:space:]]\([0-9a-f]+[[:space:]][0-9]{4}-[0-9]{2}-[0-9]{2}\)$"
           require_match active_toolchain "$(capture rustup show active-toolchain)" \
-            '^1\.96\.1-x86_64-unknown-linux-gnu([[:space:]]|$)'
+            "^${pin_regex}-x86_64-unknown-linux-gnu([[:space:]]|$)"
           require_eq RUSTUP_HOME "${RUSTUP_HOME}" "/opt/rustup"
-          require_eq RUSTUP_TOOLCHAIN "${RUSTUP_TOOLCHAIN}" "1.96.1"
           require_eq RUSTUP_AUTO_INSTALL "${RUSTUP_AUTO_INSTALL}" "0"
           require "readable /opt/rustup" test -r /opt/rustup
           require "executable /opt/rustup" test -x /opt/rustup