run github actions only on push and PR on master

.github/workflows/build_py.yml

@@ -5,10 +5,6 @@ on:
     branches:
       # push on master branch
       - master
-      # push on a feature branch
-      - feature/*
-      # push on a bugfix branch
-      - bugfix/*
   pull_request:
     branches: [ master ]
 
@@ -19,16 +15,16 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.6
-      uses: actions/setup-python@v2
-      with:
-        python-version: 3.6
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install -r requirements/base.txt
-        pip install -r requirements/development.txt
-    - name: Run tests
-      run: |
-        python -m unittest discover
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.6
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.6
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements/base.txt
+          pip install -r requirements/development.txt
+      - name: Run tests
+        run: |
+          python -m unittest discover