Add mgbench tutorial (#836)

* Add Docker runner
* Add Docker client
* Add benchgraph.sh script
* Add package script

.github/workflows/diff.yaml

@@ -437,7 +437,7 @@ jobs:
       - name: Run mgbench
         run: |
           cd tests/mgbench
-          ./benchmark.py --num-workers-for-benchmark 12 --export-results benchmark_result.json pokec/medium/*/*
+          ./benchmark.py vendor-native --num-workers-for-benchmark 12 --export-results benchmark_result.json pokec/medium/*/*
 
       - name: Upload mgbench results
         run: |