ci: Test wheel in minimal venv

This would've caught the undeclared setuptools dependency fixed in the
previous commit.

Related: #8

.github/workflows/check.yaml

@@ -75,6 +75,33 @@ jobs:
       - name: readme
         run: make readme
 
+  check-wheel:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Get pip cache dir
+        id: pip-cache
+        run: |
+          echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
+      - name: Persistent Github pip cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.pip-cache.outputs.dir }}
+          key: pip-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('pyproject.toml', 'setup.cfg', 'setup.py', 'Makefile') }}
+          restore-keys: |
+            pip-${{ runner.os }}-${{ matrix.python-version }}-
+            pip-${{ runner.os }}-
+      - name: Build wheel
+        run: make dist
+      - name: Install & run wheel
+        run: |
+          set -ex
+          PIP_WHEEL=(/usr/share/python-wheels/pip-*-py3-none-any.whl)
+          python3 -m venv --without-pip .venv-wheel
+          .venv-wheel/bin/python "$PIP_WHEEL"/pip install "$PIP_WHEEL"
+          .venv-wheel/bin/python -m pip install dist/strava_offline-*-py3-none-any.whl
+          .venv-wheel/bin/strava-offline --help
+
   check-distro:
     runs-on: ubuntu-latest