add a pip install and lint to the PR build to validate install time deps without the lock

Author: mshafer-NI

.github/workflows/PR.yml

@@ -53,13 +53,24 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
+      - name: Create a venv
+        run: python -m venv ~/venv/.cache
+      - name: Install the package
+        run: ~/venv/.cache/bin/pip install .
+      - name: Check that it runs
+        run: ~/venv/.cache/bin/nps lint
+
       - uses: Gr1N/setup-poetry@v8
         with:
           poetry-version: ${{ env.POETRY_VERSION }}
       - uses: actions/cache@v2
         with:
           path: ~/.cache/pypoetry/virtualenvs
           key: ${{ runner.os }}-poetry-${{ hashFiles('poetry.lock') }}
+      - uses: actions/cache@v2
+        with:
+          path: ~/venv/.cache
+          key: ${{ runner.os }}-venv-${{ hashFiles('poetry.lock') }}
       - name: Install the Package
         run: poetry install
       - name: Run tests