Use Github Actions to build and deploy the website

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+name: build-html
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.8'
+
+      - name: Install requirements
+        run: pip install -r requirements.txt
+
+      - name: Build the website
+        run: make all
+
+      - name: Push to genericmappingtools.github.io
+        if: success() && github.event_name == 'push'
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+          external_repository: GenericMappingTools/genericmappingtools.github.io
+          publish_branch: master
+          publish_dir: ./_build/html
+          # Only keep the latest commit to avoid bloating the repository
+          force_orphan: true
+          user_name: 'github-actions[bot]'
+          user_email: 'github-actions[bot]@users.noreply.github.com'

README.md

@@ -1,6 +1,6 @@
 # Source for the GMT website
 
-[![TravisCI status](http://img.shields.io/travis/GenericMappingTools/website.svg?style=flat)](https://travis-ci.org/GenericMappingTools/website)
+[![build-html](https://github.com/GenericMappingTools/website/workflows/build-html/badge.svg?event=push)](https://github.com/GenericMappingTools/website/actions?query=workflow%3Abuild-html)
 
 This repository contains the sphinx source files for building the GMT website.
 
@@ -14,15 +14,12 @@ Pushing changes to
 [GenericMappingTools/website](https://github.com/GenericMappingTools/website)
 triggers a build on [TravisCI](https://travis-ci.org/GenericMappingTools/website).
 When changes are pushed to the `master` branch (directly or by merging a Pull
-Request), Travis will push the compiled site to the
+Request), Github Actions will push the compiled site to the
 [GenericMappingTools/genericmappingtools.github.io](https://github.com/GenericMappingTools/genericmappingtools.github.io)
 repository.
 Github serves this repository under
 [http://genericmappingtools.github.io](http://genericmappingtools.github.io/).
-
-Pushing the changes from Travis is handled by [doctr](https://github.com/drdoctr/doctr).
-See `.travis.yml`.
-
+See `.github/workflows/build.yml`.
 
 ## License
 

environment.yml

@@ -3,8 +3,7 @@ channels:
     - conda-forge
     - defaults
 dependencies:
-    - python=3.6
+    - python=3.8
     - pip
     - sphinx
     - sphinx_bootstrap_theme
-    - doctr

requirements.txt

@@ -1,3 +1,2 @@
 sphinx
 sphinx_bootstrap_theme
-doctr