Parametrize Poetry version in CI workflow

Author: youtux

.github/workflows/main.yml

@@ -5,6 +5,9 @@ on:
   pull_request:
   workflow_dispatch:
 
+env:
+  POETRY_VERSION: "2.2.1"
+
 jobs:
   build:
     name: Build package
@@ -16,7 +19,7 @@ jobs:
         with:
           cache: "pip"
       - name: Install poetry
-        run: python3 -m pip install poetry==2.2.1
+        run: python3 -m pip install poetry==${{ env.POETRY_VERSION }}
       - name: Install build dependencies
         run: poetry install --only build
       - name: Build a binary wheel and a source tarball
@@ -70,7 +73,7 @@ jobs:
       - name: Install poetry
         run: |
           # When upgrading poetry, remember to upgrade poetry-core in `pyproject.toml` (`build-system.requires`)
-          python -m pip install poetry==2.2.1
+          python -m pip install poetry==${{ env.POETRY_VERSION }}
 
       - name: Configure poetry
         run: |