👷 mypy_primer: check for speed regressions (#835)

Author: jorenham

.github/workflows/mypy_primer.yml

@@ -61,15 +61,16 @@ jobs:
           # fail action if exit code isn't zero or one
           (
             mypy_primer \
+            --known-dependency-selector scipy-stubs \
             --new v${MYPY_VERSION} \
+            --new-prepend-path new \
             --old v${MYPY_VERSION} \
-            --known-dependency-selector scipy-stubs \
             --old-prepend-path old \
-            --new-prepend-path new \
             --num-shards 1 \
             --shard-index ${{ matrix.shard-index }} \
             --debug \
             --output concise \
+            --show-speed-regression \
             | tee diff_${{ matrix.shard-index }}.txt
           ) || [ $? -eq 1 ]