use -e for workflows

Author: Tieqiong

.github/workflows/codecov.yml

@@ -39,7 +39,7 @@ jobs:
           conda install --file requirements/run.txt
           conda install --file requirements/test.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: |

.github/workflows/docs.yml

@@ -36,7 +36,7 @@ jobs:
           conda install --file requirements/run.txt
           conda install --file requirements/docs.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: build documents
         run: make -C doc html

.github/workflows/main.yml

@@ -37,7 +37,7 @@ jobs:
           conda install --file requirements/test.txt
           conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: python -m pytest

.github/workflows/matrix.yml

@@ -42,7 +42,7 @@ jobs:
           conda install --file requirements/test.txt
           conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: python -m pytest