Convert defunct Travis CI workflow to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+jobs:
+  build:
+    runs-on: '${{ matrix.os }}'
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+        python-version:
+          - '3.12'
+    steps:
+      - name: 'Set up Python ${{ matrix.python-version }}'
+        uses: actions/setup-python@v5
+        with:
+          python-version: '${{ matrix.python-version }}'
+          cache: pip
+          cache-dependency-path: |
+            poetry.lock
+            pyproject.toml
+      - uses: actions/checkout@v4
+      - run: pip install poetry
+      - run: poetry install --with dev
+      - run: make tests
+      - run: make cov
+      - run: coveralls

README.rst

@@ -5,9 +5,9 @@ Radon
    :alt: Codacy badge
    :target: https://www.codacy.com/app/rubik/radon/dashboard
 
-.. image:: https://img.shields.io/travis/rubik/radon/master.svg?style=for-the-badge
-    :alt: Travis-CI badge
-    :target: https://travis-ci.org/rubik/radon
+.. image:: https://img.shields.io/github/actions/workflow/status/rubik/radon/ci.yml
+    :alt: GitHub Actions badge
+    :target: https://github.com/rubik/radon/actions
 
 .. image:: https://img.shields.io/coveralls/rubik/radon/master.svg?style=for-the-badge
     :alt: Coveralls badge