Describe the bug

use esbuild to minify css will transform rgba to #rrggbbaa，android webview can‘t support：#rrggbbaa

• in vite.config.js set build.config.target with ['chrome61'] can't work
• create build.js set target with ['chrome61'] can work

build.js

const esbuild = require('esbuild')

esbuild.buildSync({
  entryPoints: ['app.css'],
  minify: true,
  target: ['chrome61'],
  outfile: 'out.css'
})

Reproduction

#app {
  background-color: rgba(0, 0, 0, 0.1);
}

const esbuild = require('esbuild')

esbuild.buildSync({
  entryPoints: ['app.css'],
  minify: true,
  outfile: 'out.css'
})

#app{background-color:#0000001a}

System Info

System:
    OS: Windows 10 10.0.19043
    CPU: (12) x64 Intel(R) Core(TM) i5-10400 CPU @ 2.90GHz
    Memory: 9.96 GB / 15.84 GB
  Binaries:
    Node: 14.17.3 - C:\Program Files\nodejs\node.EXE
    npm: 6.14.13 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.19041.1023.0), Chromium (92.0.902.73)
    Internet Explorer: 11.0.19041.906
  npmPackages:
    vite: ^2.5.0 => 2.5.0

Used Package Manager

npm

Logs

No response

Validations

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• Read the Contributing Guidelines.
• Read the docs.
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• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/vue-next instead.
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• The provided reproduction is a minimal reproducible example of the bug.