CI test for region_sharding example

.github/workflows/region_example.yml

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+name: region_example
+on: [push, pull_request]
+jobs:
+
+  build:
+    name: Region Sharding example using ${{ matrix.topo }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        topo: [etcd]
+
+    steps:
+
+    - name: Set up Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.13
+
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Get dependencies
+      run: |
+        if [ ${{matrix.os}} = "ubuntu-latest" ]; then
+          sudo apt-get update
+          sudo apt-get install -y mysql-server mysql-client make unzip g++ etcd curl git wget eatmydata
+          sudo service mysql stop
+          sudo service etcd stop
+          sudo ln -s /etc/apparmor.d/usr.sbin.mysqld /etc/apparmor.d/disable/
+          sudo apparmor_parser -R /etc/apparmor.d/usr.sbin.mysqld
+        elif [ ${{matrix.os}} = "macos-latest" ]; then
+          brew install mysql@5.7 make unzip etcd curl git wget
+        fi
+        go mod download
+
+    - name: Run make minimaltools
+      run: |
+        make minimaltools
+
+    - name: Build
+      run: |
+        make build
+
+    - name: region_example
+      timeout-minutes: 30
+      run: |
+        export TOPO=${{matrix.topo}}
+        if [ ${{matrix.os}} = "macos-latest" ]; then
+          export PATH="/usr/local/opt/mysql@5.7/bin:$PATH"
+        fi
+        # Make sure that testing is entirely non-reliant on config
+        mv config config-moved
+        sed -i 's/user\/my-vitess/runner\/work\/vitess\/vitess/g' examples/region_sharding/main_vschema.json #set correct path to countries.json
+        eatmydata -- test/region_example.sh

test/region_example.sh

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+#!/bin/bash
+
+# Copyright 2020 The Vitess 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.
+
+# This test runs through the scripts in examples/region_sharding to make sure they work.
+# It should be kept in sync with the steps in https://vitess.io/docs/user-guides/region-sharding/
+# So we can detect if a regression affecting a tutorial is introduced.
+
+source build.env
+
+set -xe
+
+cd "$VTROOT/examples/region_sharding"
+unset VTROOT # ensure that the examples can run without VTROOT now.
+
+source ./env.sh # Required so that "mysql" works from alias
+
+./101_initial_cluster.sh
+
+sleep 5 # Give vtgate time to really start.
+
+mysql < insert_customers.sql
+mysql --table < show_data.sql
+
+./201_teardown.sh