fix: resolve CI test failures by cd into devtoolbelt directory

.gitea/workflows/ci.yml

@@ -20,16 +20,25 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          cd devtoolbelt
           pip install -e ".[dev]"
 
       - name: Run tests
-        run: pytest tests/ -v
+        run: |
+          cd devtoolbelt
+          pytest tests/ -v
 
       - name: Run linting
-        run: ruff check .
+        run: |
+          cd devtoolbelt
+          pip install ruff
+          ruff check .
 
       - name: Run type checking
-        run: pip install mypy && mypy devtoolbelt
+        run: |
+          cd devtoolbelt
+          pip install mypy
+          mypy devtoolbelt
 
   build:
     runs-on: ubuntu-latest
@@ -43,10 +52,16 @@ jobs:
           python-version: '3.11'
 
       - name: Install build dependencies
-        run: pip install build
+        run: |
+          cd devtoolbelt
+          pip install build
 
       - name: Build package
-        run: python -m build
+        run: |
+          cd devtoolbelt
+          python -m build
 
       - name: Verify build
-        run: pip install dist/*.whl --dry-run
+        run: |
+          cd devtoolbelt
+          pip install dist/*.whl --dry-run