ci: cache poetry installation

.gitea/workflows/build.yml

@@ -20,7 +20,15 @@ jobs:
           python-version: "3.13.1"
           cache: "pip"
 
+      - name: Load cached Poetry installation
+        id: cached-poetry
+        uses: actions/cache@v4
+        with:
+          path: ~/.local
+          key: poetry-0 # increment to reset cache
+
       - name: Install and configure Poetry
+        if: steps.cached-poetry.outputs.cache-hit != 'true'
         uses: snok/install-poetry@v1
         with:
           virtualenvs-create: false
@@ -32,7 +40,7 @@ jobs:
 
       - name: Verify that poetry.lock is consistent with pyproject.toml
         run: |
-          poetry lock --check
+          poetry check --lock
 
       - name: Install dependencies
         run: |