Update github script so that poetry actually installs.

.github/workflows/main.yml

@@ -3,6 +3,11 @@ on:
     tags:
       - release.**
 
+env:
+  PYTHON_VERSION: "3.9"
+  POETRY_VERSION: "1.8.1"
+  POETRY_URL: https://install.python-poetry.org
+
 jobs:
   build:
     strategy:
@@ -15,16 +20,31 @@ jobs:
       - name: Check-out repository
         uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v4
+      - name: Set up Python ${{ env.PYTHON_VERSION }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+        id: setup_python
+
+      # Poetry cache depends on OS, Python version and Poetry version.
+      - name: Cache Poetry cache
+        uses: actions/cache@v3
         with:
-          python-version: "3.9"
-      - uses: Gr1N/setup-poetry@v8
-      - uses: actions/cache@v2
+          path: ~/.cache/pypoetry
+          key: poetry-cache-${{ runner.os }}-${{ steps.setup_python.outputs.python-version }}-${{ env.POETRY_VERSION }}
+      # virtualenv cache should depends on OS, Python version and `poetry.lock` (and optionally workflow files).
+      - name: Cache Packages
+        uses: actions/cache@v3
         with:
-          path: ~/.cache/pypoetry/virtualenvs
-          key: ${{ runner.os }}-poetry-${{ hashFiles('poetry.lock') }}
-      - run: poetry --version
-
+          path: ~/.local
+          key: poetry-local-${{ runner.os }}-${{ steps.setup_python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}-${{ hashFiles('.github/workflows/*.yml') }}
+      - name: Install Poetry ${{ env.POETRY_VERSION }}
+        run: |
+          curl -sSL ${{ env.POETRY_URL }} | python - --version ${{ env.POETRY_VERSION }}
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+      - name: Install Dependencies
+        run: poetry install
+
       - name: Build Executable
         uses: Nuitka/Nuitka-Action@main
         with: