Apply suggestions from code review

Author: Cadair

.github/workflows/tox.yml

@@ -240,8 +240,8 @@ jobs:
       - if: ${{ (success() || failure()) && contains(matrix.coverage, 'github') && matrix.pytest == 'true' }}
         name: add run info to coverage filename
         run: |
-          find ${{GITHUB_WORKSPACE}} -name .coverage
-          mv $(find ${{GITHUB_WORKSPACE}} -name .coverage) .coverage.${{ github.sha }}-${{ runner.os }}-${{ runner.arch }}-${{ matrix.toxenv }}
+          find ${{ github.workspace }} -name .coverage
+          mv $(find ${{ github.workspace }} -name .coverage) .coverage.${{ github.sha }}-${{ runner.os }}-${{ runner.arch }}-${{ matrix.toxenv }}
         shell: sh
 
       - name: Upload coverage data to GitHub