chore: cache uv .venv in cicd

.gitea/workflows/add-new-service.yml

@@ -31,9 +31,21 @@ jobs:
           SERVICE_NAME="${BRANCH#feature/add-service-}"
           echo "service_name_lower=$SERVICE_NAME" >> $GITHUB_OUTPUT
 
-      - name: Initialize Virtual Environment from cli/pyproject.toml
+      - name: Cache Python Virtual Environment
+        uses: actions/cache@v4
+        with:
+          path: .venv
+          # Changes uv.lock will automatically invalidate the cache and rebuild
+          key: ${{ runner.os }}-uv-venv-${{ hashFiles('cli/uv.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-uv-venv-
+
+      - name: Initialize Virtual Environment from cli/uv.lock
         run: |
-          uv venv .venv
+          # Only create the venv if the cache didn't restore an existing one
+          if [ ! -d ".venv" ]; then
+            uv venv .venv
+          fi
           uv sync --directory cli
 
       - name: Install Ansible Galaxy Collections