Use the Codecov GitHub Action (#497)

* Use the Codecov GitHub Action.

* Try single quotes.

* Limit scope of Codecov token.

.github/workflows/ci-tests.yml

@@ -26,7 +26,6 @@ jobs:
       run:
         shell: bash -l {0}
     env:
-      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       CYTHON_COVERAGE: 1
       ENV_NAME: "ci-tests"
     strategy:
@@ -40,7 +39,6 @@ jobs:
           - os: ubuntu-latest
             version: py312
             posargs: "--cov-report=xml --cov"
-            post-command: codecov
           - os: macos-latest
             version: py312
             platform: osx
@@ -109,10 +107,14 @@ jobs:
         key: ${{ runner.os }}-tox-${{ env.ENV_NAME }}-${{ matrix.version }}-p${{ env.CACHE_PERIOD }}-b${{ env.CACHE_BUILD }}-${{ hashFiles(env.TOX_INI) }}
 
     - name: "Run ${{ matrix.os }} on ${{ matrix.version}} tests"
-      env:
-        POST_COMMAND: ${{ matrix.post-command }}
       run: |
         export PATH=${{ matrix.gitpath-prepend }}$PATH
         which git
         git --version
         tox -e ${{ matrix.version }}-${{ matrix.platform }}-test -- ${{ matrix.posargs }}
+
+    - name: "Upload coverage report to Codecov"
+      if: contains(matrix.posargs, '--cov')
+      uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}

tox.ini

@@ -46,11 +46,8 @@ conda_spec =
 description =
     Perform cf-units unit/integration tests.
 passenv =
-    CODECOV_TOKEN
     CYTHON_COVERAGE
-    POST_COMMAND
 usedevelop =
     true
 commands =
     pytest {posargs}
-    {env:POST_COMMAND:}