install project for pre-commit workflow so creosote can access the venv

.github/workflows/pre-commit.yaml

@@ -17,5 +17,37 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-python@v3
+
+      - name: Cache $HOME/.local # Significantly speeds up Poetry Install
+        uses: actions/cache@v3
+        with:
+          path: ~/.local
+          key: dotlocal-${{ runner.os }}-${{ hashFiles('.github/workflows/tests.yml') }}
+
+      - uses: actions/setup-python@v4
+
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+          installer-parallel: true
+
+      - name: Load pip cache
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: pip-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}
+          restore-keys: ${{ runner.os }}-pip
+
+      - name: Load cached venv
+        id: cached-poetry-dependencies
+        uses: actions/cache@v3
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+
+      - name: Install Belay
+        run: poetry install --no-interaction
+
       - uses: pre-commit/[email protected]