Migrate release of docs from travis-ci to github actions (#5162)

.github/actions/mkdocs/Dockerfile

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+FROM squidfunk/mkdocs-material:4.6.3
+
+COPY action.sh /action.sh
+
+RUN apk add --no-cache bash \
+  && chmod +x /action.sh
+
+ENTRYPOINT ["/action.sh"]

.github/actions/mkdocs/action.sh

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+#!/bin/bash
+
+# Copyright 2020 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+REQUIREMENTS="${GITHUB_WORKSPACE}/requirements.txt"
+
+if [ -f "${REQUIREMENTS}" ]; then
+    pip install -r "${REQUIREMENTS}"
+fi
+
+if [ -n "${GITHUB_TOKEN}" ]; then
+    remote_repo="https://x-access-token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
+elif [ -n "${PERSONAL_TOKEN}" ]; then
+    remote_repo="https://x-access-token:${PERSONAL_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
+fi
+
+git config --global user.name "$GITHUB_ACTOR"
+git config --global user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+mkdocs build --config-file "${GITHUB_WORKSPACE}/mkdocs.yml"
+
+git clone --branch=gh-pages --depth=1 "${remote_repo}" gh-pages
+cd gh-pages
+
+# TODO: enable before release of helm chart
+# copy current index file index.yaml before any change
+#temp_worktree=$(mktemp -d)
+#cp --force "index.yaml" "$temp_worktree/index.yaml"
+# remove current content in branch gh-pages
+git rm -r .
+# copy new doc.
+cp -r ../site/* .
+# restore chart index
+# TODO: enable before release of helm chart
+#cp "$temp_worktree/index.yaml" .
+# commit changes
+git add .
+git commit -m "Deploy GitHub Pages"
+git push --force --quiet "${remote_repo}" gh-pages > /dev/null 2>&1

.github/actions/mkdocs/action.yml

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+# action.yml
+name: 'Deploy MkDocs'
+description: 'Deploys MkDocs site'
+branding:
+  icon: 'arrow-up-circle'
+  color: 'orange'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/workflows/main.yaml

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+name: docs and Helm chart
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout master
+        uses: actions/checkout@v1
+
+      #- name: Run chart-releaser
+      #  uses: helm/chart-releaser-action@v1.0.0-alpha.2
+      #  env:
+      #    CR_TOKEN: "${{ secrets.PERSONAL_TOKEN }}"
+
+      - name: Deploy docs
+        uses: ./.github/actions/mkdocs
+        env:
+          PERSONAL_TOKEN: ${{ secrets.PERSONAL_TOKEN }}