Add github workflows to update translation

Author: zhsj

.github/actions/commit/Dockerfile

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+FROM debian:stable-slim
+
+RUN set -ex \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends git ca-certificates \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+ADD entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/commit/action.yml

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+name: Commit Translation
+description: Commit translation in git repo and push to remote
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/commit/entrypoint.sh

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+#!/bin/bash
+
+set -ex
+
+cd docs || exit 1
+git config user.email "actions@users.noreply.github.com"
+git config user.name "Github Actions"
+if git status -s|grep '\.po'; then
+  git add .
+  git commit -m '[po] auto sync'
+  header="$(echo -n token:"$GITHUB_TOKEN" | base64)"
+  git -c http.extraheader="AUTHORIZATION: basic $header" push
+fi

.github/actions/update/Dockerfile

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+FROM python:3-slim
+
+RUN set -ex \
+    && pip install transifex-client \
+    && rm -rf ~/.cache \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends git make \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+ADD entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/update/action.yml

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+name: Update Translation
+description: Update Python Doc Translation from Transifex
+inputs:
+  pythonVersion:
+    description: Python Version
+    required: true
+  locale:
+    description: Locale Name
+    required: true
+    default: zh_CN
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.pythonVersion }}
+    - ${{ inputs.locale }}

.github/actions/update/entrypoint.sh

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+#!/bin/bash
+
+set -ex
+
+pythonVersion="$1"
+locale="$2"
+
+echo "Python Version: $pythonVersion"
+echo "Locale: $locale"
+
+cur=$(pwd)
+git clone --depth=1 --branch="$pythonVersion" https://github.com/python/cpython cpython
+git clone --branch="$pythonVersion" https://github.com/"$GITHUB_REPOSITORY" docs
+
+if [[ -n "$TRANSIFEX_APIKEY" ]]; then
+  cat > ~/.transifexrc << EOF
+[https://www.transifex.com]
+api_hostname = https://api.transifex.com
+hostname = https://www.transifex.com
+password = $TRANSIFEX_APIKEY
+username = api
+EOF
+fi
+
+# Pull Transifex translation
+pushd docs || exit 1
+tx pull --force --parallel --language "$locale"
+popd || exit 1
+
+# Test building docs
+pushd cpython/Doc || exit 1
+mkdir -p locales/"$locale"/
+ln -sfn "$cur"/docs locales/"$locale"/LC_MESSAGES
+make venv
+make html SPHINXOPTS="-D language=$locale -D gettext_compact=0 -j4 -W --keep-going"
+popd || exit 1

.github/workflows/python-37.yml

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+name: python-37
+
+on:
+  push:
+    branches:
+      - master
+  schedule:
+    - cron: "38 * * * *"
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - uses: ./.github/actions/update
+        with:
+          pythonVersion: "3.7"
+          locale: zh_CN
+        env:
+          TRANSIFEX_APIKEY: ${{ secrets.TRANSIFEX_APIKEY }}
+      - uses: ./.github/actions/commit
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/python-38.yml

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+name: python-38
+
+on:
+  push:
+    branches:
+      - master
+  schedule:
+    - cron: "18 * * * *"
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - uses: ./.github/actions/update
+        with:
+          pythonVersion: "3.8"
+          locale: zh_CN
+        env:
+          TRANSIFEX_APIKEY: ${{ secrets.TRANSIFEX_APIKEY }}
+      - uses: ./.github/actions/commit
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}