Simplified whl install in tests CI

.github/workflows/build.yml

@@ -54,15 +54,8 @@ jobs:
           name: "Python wheel"
 
       - name: Install wheel
-        if: runner.os == 'Windows'
-        run: |
-              $TARGET = Resolve-Path "${{github.workspace}}/livermask-*.whl" | Select -ExpandProperty Path
-              echo $TARGET
-              pip install --find-links=${{github.workspace}} $TARGET
-
-      - name: Install wheel
-        if: runner.os != 'Windows'
-        run: pip install --find-links=${{github.workspace}} livermask-*.whl
+        run: pip install --find-links=. livermask-*.
+        shell: bash
 
       - name: Test CLI
         run: livermask --help