Add a workflow to build and deploy docs site

.github/actions/bootstrap

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -e
+
+gem update --system --no-document
+gem update bundler --no-document
+bundle install --jobs 4 --retry 3

.github/actions/deploy_docs

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -e
+
+bundle exec jekyll build -s docs -d docs/_site -Vt
+cd docs/_site
+touch .nojekyll
+remote_branch="gh-pages-trial"
+
+echo "Publishing to ${GITHUB_REPOSITORY} on branch ${remote_branch}"
+remote_repo="https://x-access-token:${JEKYLL_PAT}@github.com/${GITHUB_REPOSITORY}.git"
+
+git init -q
+git config user.name "${GITHUB_ACTOR}"
+git config user.email "${GITHUB_ACTOR}@users.noreply.github.com"
+git add .
+git commit -qm "[GH ACTIONS] Build triggered by ${GITHUB_SHA}"
+
+echo ""
+git push --force $remote_repo master:$remote_branch
+
+cd ../..
+exit 0

.github/workflows/deploy_docs.yml

@@ -0,0 +1,20 @@
+name: Build and deploy Jekyll documentation site
+on:
+  pull_request:
+    branches:
+      - master
+jobs:
+  deploy_docs:
+    if: "!contains(github.event.commits[0].message, '[ci skip]')"
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-ruby@v1
+        with:
+          ruby-version: 2.7.x
+      - name: Set up dependencies
+        run: bash .github/actions/bootstrap
+      - name: Build and Deploy
+        run: bash .github/actions/deploy_docs
+        env:
+          JEKYLL_PAT: ${{ secrets.GITHUB_TOKEN }}