How to use custom Node version on Azure App Service Linux

postdeploy.sh

#!/bin/bash
# Usage
# 1.Save this file to project root directory
# 2.Defaul POST_BUILD_COMMAND in appsettings
#   https://learn.microsoft.com/en-us/azure/app-service/configure-language-nodejs?pivots=platform-linux#customize-build-automation
#  > az webapp config appsettings set --name <app-name> --resource-group <resource-group-name> --settings POST_BUILD_COMMAND="postbuild.sh"
# 3.Enable remote build
#   https://github.com/projectkudu/kudu/wiki/Configurable-settings#enabledisable-build-actions
# 4.Update start script to use LTS binary instead of default Node.
#   LTS binary path is defined in /home/site/lts_node_path
#   "scripts": {
#     "start": "NODELTS=`cat /home/site/lts_node_path`; echo 'Run app with' && ${NODELTS} -v; ${NODELTS} dist/node/index.js",
#   },
# 5.Push to Azure

# Install NVM to /home.site/.nvm
cd /home/site/
export NVM_DIR=/home/site/.nvm && (
  git clone https://github.com/nvm-sh/nvm.git "$NVM_DIR"
  cd "$NVM_DIR"
  git checkout `git describe --abbrev=0 --tags --match "v[0-9]*" $(git rev-list --tags --max-count=1)`
) && \. "$NVM_DIR/nvm.sh"

# Install node lts
nvm install --lts

# Find executable node path
echo `nvm which current` > /home/site/lts_node_path

# Use LTS Node binary with NPM start script
#
#  "scripts": {
#    "start": "NODELTS=`cat /home/site/lts_node_path`; echo 'Run app with' && ${NODELTS} -v; ${NODELTS} dist/node/index.js",
#  },
#