fix(ci): use editable install for reliable coverage tracing

Author: greyllmmoder

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install ".[dev,image,pdf]"
+          python -m pip install -e ".[dev,image,pdf]"
 
       - name: Run tests
         run: |
@@ -43,7 +43,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install ".[dev,image,pdf]"
+          python -m pip install -e ".[dev,image,pdf]"
 
       - name: Lint
         run: |