Run codecov before every PR

.github/workflows/workflow.yml

@@ -3,6 +3,31 @@ name: Run checks
 on: [pull_request]
 
 jobs:
+  codecov-of-main:
+    name: codecov of main
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install .[dev]
+      - name: Generate coverage report
+        run: python -m pytest --cov --cov-report=xml
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          fail_ci_if_error: false
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: Stoops-ML/czml3
+          verbose: true
+
   tox-checks:
     runs-on: ubuntu-latest
     strategy:
@@ -21,8 +46,10 @@ jobs:
     - name: Test with tox
       run: tox
 
-  codecov:
-    name: codecov
+  codecov-of-PR:
+    name: codecov of PR
+    needs:
+      - codecov-of-main
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4