fix: Fix env var format in GH Actions

Author: anth-volk

.github/workflows/push.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Upload coverage reports to Codecov
         uses: codecov/[email protected]
         env:
-          token: ${{ secrets.CODECOV_TOKEN }}
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with:
           verbose: true
       - name: Set up Cloud SDK