ci: test floors the CI10 way (#273)

Author: lesnik512

.github/workflows/_checks.yml

@@ -52,8 +52,9 @@ jobs:
           name: codecov-${{ matrix.python-version }}
 
   floors:
-    # CI6. Nothing else in CI installs the declared floors: `pytest` resolves highest, and the
-    # scheduled run does the same. Wheel coverage is per interpreter, so every matrix entry runs.
+    # CI10. Nothing else in CI installs the declared floors: `pytest` resolves highest, and the
+    # scheduled run does the same. This job installs them exactly on 3.10, and the lowest
+    # versions with a wheel on every other entry.
     # Skipped on the schedule: the floors do not move, and the scheduled `pytest` already covers
     # the newest releases, which are what users install.
     if: github.event_name != 'schedule'
@@ -75,7 +76,10 @@ jobs:
       - run: uv python install ${{ matrix.python-version }}
       - run: uv python pin ${{ matrix.python-version }}
       - run: uv venv
-      - run: uv pip compile pyproject.toml --all-extras --no-deps --resolution lowest-direct -o floors.txt
+      - if: matrix.python-version == '3.10'
+        run: uv pip compile pyproject.toml --all-extras --no-deps --resolution lowest-direct -o floors.txt
+      - if: matrix.python-version != '3.10'
+        run: uv pip compile pyproject.toml --all-extras --resolution lowest-direct --no-build -o floors.txt
       - run: uv pip install -r pyproject.toml --all-extras --group dev --constraints floors.txt --no-build
       - run: uv run --no-sync pytest .
         env: