Add cache action to ci

.github/workflows/ci.yml

@@ -21,6 +21,12 @@ jobs:
     steps:
       - name: Start MySQL
         run: sudo systemctl start mysql.service
+      - uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/poetry.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with: