Flag Codecov uploads for easier coverage checking/debugging

.appveyor.yml

@@ -81,7 +81,7 @@ test_script:
 
 after_test:
 - pip install codecov
-- codecov --file coverage.xml --name %PYTHON%
+- codecov --file coverage.xml --name %PYTHON% --flags AppVeyor
 
 matrix:
   fast_finish: true

.ci/after_success.sh

@@ -9,7 +9,7 @@ else
 fi
 
 if [[ $TRAVIS ]]; then
-    codecov
+    codecov --flags TravisCI
 fi
 
 if [ "$TRAVIS_PYTHON_VERSION" == "3.8" ]; then

.github/workflows/test-docker.yml

@@ -66,4 +66,5 @@ jobs:
       uses: codecov/codecov-action@v1
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
+        flags: GHADocker
         name: ${{ matrix.docker }}

.github/workflows/test-windows.yml

@@ -361,6 +361,7 @@ jobs:
       with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.xml
+          flags: GHAWindows
           name: ${{ runner.os }} Python ${{ matrix.python-version }}
 
     - name: Build wheel

.github/workflows/test.yml

@@ -97,4 +97,5 @@ jobs:
       uses: codecov/codecov-action@v1
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
+        flags: GHA
         name: ${{ matrix.os }} Python ${{ matrix.python-version }}