Split workflows on push and pull request

This patch duplicates the workflows so that they do not run in double
for no reason. This saves some CO2 in the atmosphere.

.github/workflows/ci_with_osx_on_pull_request.yml

@@ -0,0 +1,22 @@
+name: Continuous Integration on Pull Request - OSX
+
+on: [pull_request]
+
+jobs:
+  tests:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.x
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.x
+
+    - name: Install Dependencies
+      run: |
+        pip3 install .[dev]
+
+    - name: Check
+      run: |
+        python precommit.py

.github/workflows/ci_with_osx.yml → .github/workflows/ci_with_osx_on_push_to_main.yml

@@ -1,6 +1,11 @@
 name: Continuous Integration - OSX
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+      - main
+
 
 jobs:
   tests:

.github/workflows/ci_with_ubuntu_on_pull_request.yml

@@ -0,0 +1,47 @@
+name: Continuous Integration on Pull Request - Ubuntu
+
+on: [pull_request]
+
+jobs:
+  Execute:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.x
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.x
+
+    - name: Install Dependencies
+      run: |
+        python3 -m pip install --upgrade pip
+        pip3 install --upgrade coveralls
+        pip3 install .[dev]
+
+    - name: Check
+      run: |
+        python precommit.py
+
+    - name: Upload Coverage
+      run: coveralls --service=github
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        COVERALLS_FLAG_NAME: ${{ matrix.python-version }}
+        COVERALLS_PARALLEL: true
+
+  Finish-Coveralls:
+    name: Finish Coveralls
+    needs: Execute
+    runs-on: ubuntu-latest
+    container: python:3-slim
+    steps:
+      - name: Finish Coveralls
+        run: |
+          pip3 install --upgrade coveralls
+          coveralls --finish --service=github
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci_with_ubuntu.yml → .github/workflows/ci_with_ubuntu_on_push_to_main.yml

@@ -1,6 +1,10 @@
 name: Continuous Integration - Ubuntu
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+      - main
 
 jobs:
   Execute:

.github/workflows/ci_with_windows_on_pull_request.yml

@@ -0,0 +1,22 @@
+name: Continuous Integration on Pull Request - Windows
+
+on: [pull_request]
+
+jobs:
+  tests:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.x
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.x
+
+    - name: Install Dependencies
+      run: |
+        pip3 install .[dev]
+
+    - name: Check
+      run: |
+        python precommit.py

.github/workflows/ci_with_windows.yml → .github/workflows/ci_with_windows_on_push_to_main.yml

@@ -1,6 +1,10 @@
 name: Continuous Integration - Windows
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+      - main
 
 jobs:
   tests: