Run mypy on GitHub actions. (twisted#1349)

* Run mypy on GitHub actions based on GitHub Actions template for Python.

- Remove mypy from azure pipelines.
- Run on any change.
- Add a status badge for GitHub Actions on mypy
- Update mypy run.

Author: adiroiban
Reviewer: rodrigc
Fixes: ticket:9903

.github/workflows/mypy.yaml

@@ -0,0 +1,48 @@
+#
+# GitHub actions Python based test runs.
+#
+# Available VMs:
+# https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners
+#
+# Example Python workflow
+# https://docs.github.com/en/actions/language-and-framework-guides/using-python-with-github-actions#starting-with-the-python-workflow-template
+name: mypy
+
+on:
+  push:
+    branches: [ trunk ]
+  pull_request:
+    branches: [ trunk ]
+
+jobs:
+  test_run:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.8'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip tox
+        tox -e mypy --notest
+
+    # You can test your matrix by printing the current Python version
+    - name: Display Python information
+      run: |
+        python --version
+        python -c "import sys; print(sys.prefix)"
+        python -c "import sys; print(sys.exec_prefix)"
+        python -c "import sys; print(sys.executable)"
+        python -c "import struct; print(struct.calcsize('P') * 8)"
+        python -c 'print("\nENVIRONMENT VARIABLES\n=====================\n")'
+        python -c "import os; [print(k, v) for k,v in os.environ.items()]"
+
+    - name: Test with mypy
+      run: |
+        tox -q -e mypy

README.rst

@@ -4,6 +4,7 @@ Twisted
 |pypi|_
 |travis|_
 |circleci|_
+|mypy|_
 
 For information on changes in this release, see the `NEWS <NEWS.rst>`_ file.
 
@@ -111,3 +112,6 @@ Again, see the included `LICENSE <LICENSE>`_ file for specific legal details.
 
 .. |circleci| image:: https://circleci.com/gh/twisted/twisted.svg?style=svg
 .. _circleci: https://circleci.com/gh/twisted/twisted
+
+.. |mypy| image:: https://github.com/twisted/twisted/workflows/mypy.yaml/badge.svg
+.. _mypy: https://github.com/twisted/twisted

azure-pipelines/tests_pipeline.yml

@@ -40,5 +40,3 @@ jobs:
       py37: "3.7"
       py38: "3.8"
     reactor: iocp
-
-- template: 'mypy_jobs.yml'