Updated benchmark workflow with different build command

Using the one from the README now as opposed to the one from the build.yml

.github/workflows/benchmark.yml

@@ -44,18 +44,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      # Build Luau
-      - name: make test
-        run: |
-          make -j2 config=sanitize werror=1 test
-      - name: make test w/flags
-        run: |
-          make -j2 config=sanitize werror=1 flags=true test
-      - name: make cli
-        run: |
-          make -j2 config=sanitize werror=1 luau luau-analyze # match config with tests to improve build time
-          ./luau tests/conformance/assert.lua
-          ./luau-analyze tests/conformance/assert.lua
+      - name: Build Luau
+        run: make config=release luau luau-analyze
 
       - uses: actions/setup-python@v3
         with: