feat: add SKIP_UPDATE_CHECK env var (#358)

README.md

@@ -8,10 +8,13 @@ warns if there is a newer version of CLI released
 
 <!-- toc -->
 
+- [@oclif/plugin-warn-if-update-available](#oclifplugin-warn-if-update-available)
 - [What is this?](#what-is-this)
 - [How it works](#how-it-works)
 - [Installation](#installation)
 - [Configuration](#configuration)
+  - [Example configuration](#example-configuration)
+- [Environment Variables](#environment-variables)
 <!-- tocstop -->
 
 # What is this?
@@ -64,3 +67,8 @@ any of the following configuration properties:
   }
 }
 ```
+
+# Environment Variables
+
+`<CLI>_SKIP_UPDATE_CHECK`: Skip this version check
+`<CLI>_FORCE_VERSION_CACHE_UPDATE`: Force the version cache to update

src/hooks/init/check-update.ts

@@ -22,7 +22,7 @@ const hook: Hook<'init'> = async function ({config}) {
   const checkVersion = async () => {
     try {
       // do not show warning if updating
-      if (process.argv[2] === 'update') return
+      if (process.argv[2] === 'update' || this.config.scopedEnvVarTrue('SKIP_UPDATE_CHECK')) return
       const distTags = JSON.parse(await readFile(file, 'utf8'))
       if (config.version.includes('-')) {
         // to-do: handle prerelease channels
@@ -48,6 +48,7 @@ const hook: Hook<'init'> = async function ({config}) {
 
   const refreshNeeded = async () => {
     if (this.config.scopedEnvVarTrue('FORCE_VERSION_CACHE_UPDATE')) return true
+    if (this.config.scopedEnvVarTrue('SKIP_UPDATE_CHECK')) return false
     try {
       const {mtime} = await stat(file)
       const staleAt = new Date(mtime.valueOf() + 1000 * 60 * 60 * 24 * timeoutInDays)