build: fix Codecov unable to process coverage reports (#52)

The coverage reports (cobertura format) were silently erroring in Codecov's
servers due to being unable to compare them against the source code.

This was due to the `codecov` CLI being unable to normalize the reports (XML)
as it didn't find a source code or paths that matched what it was seeing
inside the XML file, e.g., it would see `/home/runner/work/pytest-django-queries/pytest-django-queries/src`
in the XML files but without checkout, it wasn't able to read that file thus
leading to corrupt coverage reports being uploaded.

Author: NyanKiyoshi

.github/workflows/test.yaml

@@ -101,12 +101,18 @@ jobs:
           || github.event.pull_request.head.repo.full_name == 'NyanKiyoshi/pytest-django-queries'
       }}
     runs-on: ubuntu-latest
-    permissions: {}
     environment: codecov
+    permissions:
+      contents: read
 
     needs: test
 
     steps:
+      # Codecov needs to be able to map the coverage against local files,
+      # thus we need to checkout.
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
       - name: Download Reports
         uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         with:
@@ -132,11 +138,17 @@ jobs:
         )
       }}
     runs-on: ubuntu-latest
-    permissions: {}
+    permissions:
+      contents: read
 
     needs: test
 
     steps:
+      # Codecov needs to be able to map the coverage against local files,
+      # thus we need to checkout.
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
       - name: Download Reports
         uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         with:

pyproject.toml

@@ -59,7 +59,6 @@ dev = [
     "sphinx-rtd-theme",
 ]
 test = [
-    "codecov",
     "coverage",
     "pytest-xdist",
 ]