Update action.yml

Author: dciborow

action.yml

@@ -147,7 +147,7 @@ runs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install pytest flit
-        cd "${{ inputs.root }}"
+        cd "${{ inputs.root }}/${{ inputs.workdir }}"
         python -m flit install
         python -m pytest '${{ inputs.args }}' ${{ inputs.testdir }}
       shell: bash