fix github action workflow

Author: robkooper

.github/workflows/ci.yaml

@@ -1,6 +1,8 @@
 name: Python package
 
-on: [push]
+on:
+  push:
+  pull_request:
 
 jobs:
   build:

.github/workflows/pypi.yaml

@@ -5,6 +5,7 @@ on:
     branches:
       - main
       - master
+  pull_request:
 
 jobs:
   publish:
@@ -49,7 +50,7 @@ jobs:
           python setup.py sdist bdist_wheel
 
       - name: Publish distribution to PyPI
-        if: steps.release_info.outputs.version != 'unreleased'
+        if: github.event_name == 'push' && env.BRANCH == 'master' && steps.release_info.outputs.version != 'unreleased'
         uses: pypa/gh-action-pypi-publish@master
         with:
           password: ${{ secrets.pypi_password }}

.github/workflows/release.yaml

@@ -3,7 +3,6 @@ name: Create Release
 on:
   push:
     branches:
-      - main
       - master
 
 jobs:
@@ -27,7 +26,7 @@ jobs:
           echo "::set-output name=changelog::$changelog"
 
       - name: create release
-        if: steps.release_info.outputs.version != 'unreleased'
+        if: github.event_name == 'push' && env.BRANCH == 'master' && steps.release_info.outputs.version != 'unreleased'
         uses: actions/create-release@v1
         id: create_release
         env: