Enable CI testing in PR branch again.

.github/workflows/release.yml

@@ -2,27 +2,28 @@ on:
   push:
     branch:
       - 'development'
+      - 'add-release-ci-builds'
 
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
 
     - name: checkout
-      uses: actions/checkout@v2 
+      uses: actions/checkout@v2
 
     - name: build_release
       run: |
           python3 -m pip install --user virtualenv
           virtualenv -p python3 ./venv
           ./venv/bin/python3 -m pip install -r ./requirements.release.txt
           ./venv/bin/python3 ./release.py
-    
+
     - name: read_release_details
       run: |
         echo "TAG_NAME=$(cat ./release/tag_name.txt)" >> $GITHUB_ENV
         echo "RELEASE_TITLE=$(cat ./release/release_name.txt)" >> $GITHUB_ENV
-    
+
     - name: release
       uses: softprops/action-gh-release@v1
       with: