bench(clickhouse): remove build-time binary download, resolve clickhouse from PATH

- Remove reqwest-based binary download from build.rs
- Resolve clickhouse binary via CLICKHOUSE_BINARY env var or $PATH at runtime
- Add CI step to install clickhouse before building when needed
- Fail with clear error message if binary is not found locally

Signed-off-by: fastio <pengjian.uestc@gmail.com>

Author: fastio

.github/workflows/sql-benchmarks.yml

@@ -127,6 +127,13 @@ jobs:
 
       - uses: ./.github/actions/system-info
 
+      - name: Install ClickHouse
+        if: contains(matrix.targets, 'clickhouse:')
+        run: |
+          curl https://clickhouse.com/ | sh
+          sudo ./clickhouse install
+          echo "CLICKHOUSE_BINARY=$(which clickhouse)" >> $GITHUB_ENV
+
       - name: Build binaries
         shell: bash
         env: