ci: migrate from Travis CI to GitHub Actions

- Add ci.yml: lint (ruff + mypy) and test matrix (3.10-3.13, ubuntu/windows/macos)
- Add publish.yml: build + publish to PyPI via trusted publishing (OIDC)
- Remove .travis.yml and old python-publish.yml (username/password auth)
- Replace Travis CI and Coveralls badges with GitHub Actions badge
- Remove coveralls from dev dependencies

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dsfulf

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+    - name: Install dependencies
+      run: pip install -e ".[dev]"
+    - name: Ruff
+      run: ruff check petbox/dca
+    - name: Mypy
+      run: mypy petbox/dca
+
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ['3.10', '3.11', '3.12', '3.13']
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: pip install -e ".[dev]"
+    - name: Run tests
+      run: pytest

.github/workflows/publish.yml

@@ -0,0 +1,38 @@
+name: Publish to PyPI
+
+on:
+  release:
+    types: [created]
+
+permissions:
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+    - name: Install build tools
+      run: pip install build
+    - name: Build sdist and wheel
+      run: |
+        rm -rf dist/
+        python -m build
+    - uses: actions/upload-artifact@v4
+      with:
+        name: dist
+        path: dist/
+
+  publish:
+    needs: build
+    runs-on: ubuntu-latest
+    environment: pypi
+    steps:
+    - uses: actions/download-artifact@v4
+      with:
+        name: dist
+        path: dist/
+    - uses: pypa/gh-action-pypi-publish@release/v1

.github/workflows/python-publish.yml

@@ -10,18 +10,14 @@ Petroleum Engineering Toolbox
     :target: https://pypi.org/project/petbox-dca/
     :alt: PyPi Version
 
-.. image:: https://travis-ci.org/petbox-dev/dca.svg?branch=master
-    :target: https://travis-ci.org/github/petbox-dev/dca
-    :alt: Build Status
+.. image:: https://github.com/petbox-dev/dca/actions/workflows/ci.yml/badge.svg?branch=master
+    :target: https://github.com/petbox-dev/dca/actions/workflows/ci.yml
+    :alt: CI Status
 
 .. image:: https://readthedocs.org/projects/petbox-dca/badge/?version=latest
     :target: https://petbox-dca.readthedocs.io/en/latest/?badge=latest
     :alt: Documentation Status
 
-.. image:: https://coveralls.io/repos/github/petbox-dev/dca/badge.svg
-    :target: https://coveralls.io/github/petbox-dev/dca
-    :alt: Coverage Status
-
 .. image:: https://open.vscode.dev/badges/open-in-vscode.svg
     :target: https://open.vscode.dev/petbox-dev/dca
     :alt: Open in Visual Studio Code

.travis.yml

@@ -44,7 +44,7 @@ Homepage = "https://github.com/petbox-dev/dca"
 dev = [
     "attrs>=19.2.0",
     "coverage>=5.1",
-    "coveralls>=3.2.0",
+
     "hypothesis>=6.14.8",
     "mpmath>=1.3.0",
     "mypy>=1.0",