Skip unused Bazel install in benchmark Docker image

[Copilot]

The benchmark GitHub Actions job fails while building benchmark/Dockerfile because the pinned mimalloc-bench setup script downloads a Bazel GPG key from a URL that now returns 404.

• Benchmark image setup

  • Patches the pinned mimalloc-bench script during the Docker build.
  • Removes the standalone aptinstallbazel call before running ./build-bench-env.sh packages.
  • Keeps the pinned mimalloc-bench revision unchanged.

• Scope of change

  • Bazel is only needed for the tcg benchmark path.
  • This Dockerfile builds and runs the configured benchmark workloads against snmalloc only, so the Bazel install is unused in this job.

RUN sed -i '/^[[:space:]]*aptinstallbazel[[:space:]]*$/d' build-bench-env.sh && \
    if grep -q '^[[:space:]]*aptinstallbazel[[:space:]]*$' build-bench-env.sh; then \
      echo "failed to remove unused Bazel install"; \
      exit 1; \
    fi

[Matthew Parkinson (mjp41)]

Copilot Would it be better to migrate to the latest mimalloc-bench. I have fixed a bunch of issues there recently.

[Copilot]

Copilot Would it be better to migrate to the latest mimalloc-bench. I have fixed a bunch of issues there recently.

Good idea. Bumped the pin to fcb165f (includes your Bazel apt-key fix and other recent CI fixes, green on upstream CI) and dropped the sed patch in 6f4c8d2. Also updated the hardcoded rocksdb-8.1.1 path to rocksdb-10.10.1 since that version bumped too.

[github-actions]

Coverage report (cross-platform merged)

Lines covered (src/snmalloc/**): 2820 / 3180 (88.68%)

Merged line coverage is the per-line union across all platforms. Region coverage is reported per-platform only; no cross-platform region total is computed.

Per-directory breakdown

Directory	Lines covered	Lines executable	%
src/snmalloc/stl	2	4	50.00%
src/snmalloc/override	94	156	60.26%
src/snmalloc/pal	343	449	76.39%
src/snmalloc/mitigations	14	18	77.78%
src/snmalloc/aal	52	60	86.67%
src/snmalloc/ds_core	349	399	87.47%
src/snmalloc/global	266	303	87.79%
src/snmalloc/ds	328	357	91.88%
src/snmalloc/backend_helpers	336	356	94.38%
src/snmalloc/mem	838	873	95.99%
src/snmalloc/ds_aal	108	112	96.43%
src/snmalloc/backend	90	93	96.77%

Per-platform contributions (advisory)

Platform	Lines covered	Lines executable	Lines %	Regions covered	Regions executable	Regions %
freebsd-14	4273	4726	90.41%	3858	5677	67.96%
linux-self-host-shim-checks	4432	4888	90.67%	4075	6136	66.41%
linux-self-host-shim-checks-selfhost	1640	2323	70.60%	1500	2913	51.49%
macos-14	4249	4693	90.54%	3880	5691	68.18%
windows-2022	4172	4713	88.52%	3827	5653	67.70%