ci: benchmark compiled (mypyc) and pure builds

Add a mypyc=true/false matrix axis to the benchmark workflow so the
resolving benchmark runs for both the compiled and pure-python builds.
mypyc requires Python >= 3.10, so the run moves from 3.7 to 3.10 and both
variants run there for an apples-to-apples comparison. REZ_MYPYC is wired
into the install step, and result artifacts are named per-variant.

The store job keeps the pure (mypyc=false) result as the canonical
baseline, since store_benchmark.py keys results by python+rez version only.

Signed-off-by: Chad Dombrova <chadrik@gmail.com>

Author: chadrik

.github/workflows/benchmark.yaml

@@ -21,7 +21,8 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - '3.7'
+          - '3.10'
+        mypyc: [false, true]
 
     steps:
       - name: Checkout
@@ -33,6 +34,8 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install Rez
+        env:
+          REZ_MYPYC: ${{ matrix.mypyc && '1' || '0' }}
         run: |
           mkdir ./installdir
 
@@ -51,7 +54,7 @@ jobs:
 
       - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
-          name: "benchmark-result-${{ matrix.python-version }}"
+          name: "benchmark-result-${{ matrix.python-version }}-mypyc-${{ matrix.mypyc }}"
           path: ./out
 
   store_benchmark_result:
@@ -62,15 +65,15 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - '3.7'
+          - '3.10'
 
       # so we don't have jobs trying to push to git at the same time
       max-parallel: 1
 
     steps:
       - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
-          name: "benchmark-result-${{ matrix.python-version }}"
+          name: "benchmark-result-${{ matrix.python-version }}-mypyc-false"
           path: .
 
       - name: Checkout (release)