Switch from Travis CI to GitHub actions

.github/workflows/CI.yml

@@ -0,0 +1,32 @@
+name: CI
+
+# Trigger the workflow on push or pull request
+on:
+  - push
+  - pull_request
+
+jobs:
+  # The CI test job
+  test:
+    name: ${{ matrix.gap-branch }}
+    runs-on: ubuntu-latest
+    # Don't run this twice on PRs for branches pushed to the same repository
+    if: ${{ !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository) }}
+    strategy:
+      fail-fast: false
+      matrix:
+        gap-branch:
+          - master
+          - stable-4.11
+          - stable-4.10
+          - stable-4.9
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gap-actions/setup-gap@v2
+        with:
+          GAPBRANCH: ${{ matrix.gap-branch }}
+      - uses: gap-actions/build-pkg@v1
+      - uses: gap-actions/run-pkg-tests@v2
+      - uses: gap-actions/process-coverage@v2
+      - uses: codecov/codecov-action@v1

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/rse-standrewscs/gap-binder-template.svg?branch=master)](https://travis-ci.org/rse-standrewscs/gap-binder-template)
+[![Build Status](https://github.com/rse-standrewscs/gap-binder-template/workflows/CI/badge.svg?branch=master)](https://github.com/rse-standrewscs/gap-binder-template/actions?query=workflow%3ACI+branch%3Amaster)
 [![Code Coverage](https://codecov.io/github/rse-standrewscs/gap-binder-template/coverage.svg?branch=master&token=)](https://codecov.io/gh/rse-standrewscs/gap-binder-template)
 [![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/rse-standrewscs/gap-binder-template/master)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3662155.svg)](https://doi.org/10.5281/zenodo.3662155)