Update wheel installation in the test-build job

Retrieve the wheel to a `dist/` sub-directory and get the name of the
specific file (wheel) to be installed. Then update the installation
step to use this found filename instead of a wildcard.

Author: mcdonnnj

.github/workflows/build.yml

@@ -289,12 +289,14 @@ jobs:
         uses: actions/download-artifact@v3
         with:
           name: dist-${{ matrix.python-version }}
-      - name: Install testing dependencies
-        run: |
-          python -m pip install --upgrade pip setuptools wheel
-          python -m pip install --upgrade pytest pytest-cov
-      - name: Install the built wheel (there should only be one)
-        run: python -m pip install *.whl
+          path: dist
+      - id: find-wheel
+        name: Get the name of the retrieved wheel (there should only be one)
+        run: echo "wheel=$(ls dist/*whl)" >> $GITHUB_OUTPUT
+      - name: Update core Python packages
+        run: python -m pip install --upgrade pip setuptools wheel
+      - name: Install the built wheel
+        run: python -m pip install ${{ steps.find-wheel.outputs.wheel }}
       - name: Run tests
         env:
           RELEASE_TAG: ${{ github.event.release.tag_name }}