Run pytest from RUNNER_TEMP so installed wheel is resolved

pytest's rootdir inference added `sdk/python/` to sys.path, so
`from offbit_reflow import _native` resolved to the source directory
(Python shim only) instead of site-packages (where `_native.so`
actually lives). Cd'ing to `$RUNNER_TEMP` before running pytest drops
the source dir from sys.path and the installed wheel takes over.

Author: darmie

.github/workflows/ci-python.yml

@@ -58,5 +58,10 @@ jobs:
           # Install whatever wheel was produced for the active interpreter.
           python -m pip install --force-reinstall sdk/python/dist/*.whl
       - name: Run tests
-        working-directory: sdk/python
-        run: python -m pytest -q
+        shell: bash
+        # Run from a tmpdir so the source `sdk/python/offbit_reflow`
+        # directory isn't picked up by pytest's sys.path insertion —
+        # we want imports to resolve to the wheel installed above.
+        run: |
+          cd "$RUNNER_TEMP"
+          python -m pytest -q "$GITHUB_WORKSPACE/sdk/python/tests"

.github/workflows/publish-python.yml

@@ -144,7 +144,11 @@ jobs:
         run: |
           python -m pip install --upgrade pip pytest
           python -m pip install --find-links dist 'offbit-reflow'
-          python -m pytest -q sdk/python/tests
+          # Run from a tmpdir so pytest resolves `offbit_reflow` from
+          # site-packages, not from the source directory (which only
+          # carries the Python shim, not `_native.so`).
+          cd "$RUNNER_TEMP"
+          python -m pytest -q "$GITHUB_WORKSPACE/sdk/python/tests"
 
   publish:
     name: publish to PyPI