add install pkg command for jobs

Author: joannatk

.github/actions/lint_n_test/action.yml

@@ -39,6 +39,9 @@ runs:
     - name: PyDocStyle
       run: python -m pydocstyle
       shell: bash
+    - name: Install local ${{ inputs.input_pkg_name }} pkg in editable mode
+      run: python -m pip install -e ${{ inputs.input_pkg_name }}
+      shell: bash
     - name: Execute Unit Tests 
       run: python -m unittest discover -s ./test*
       shell: bash