add --bun option and document bunx --bun

README.md

@@ -12,6 +12,7 @@ To run once:
 
 ```
 npx --yes @flydotio/dockerfile@latest
+bunx --bun @flydotio/dockerfile@latest
 ```
 
 Or install it with your favorite package manager:
@@ -23,7 +24,7 @@ pnpm add -D @flydotio/dockerfile
 yarn add @flydotio/dockerfile --dev
 ```
 
-Once installed, you can run and re-run using `npx dockerfile` for Node.js applications or `bunx dockerfile` for Bun applications.
+Once installed, you can run and re-run using `npx dockerfile` for Node.js applications or `bunx --bun dockerfile` for Bun applications.
 
 Options are saved between runs into `package.json`. To invert a boolean options, add or remove a no- prefix from the option name.
 

gdf.js

@@ -12,6 +12,7 @@ import * as ShellQuote from 'shell-quote'
 // defaults for all the flags that will be saved
 export const defaults = {
   alpine: false,
+  bun: false,
   build: '',
   cache: false,
   cmd: '',
@@ -637,7 +638,7 @@ export class GDF {
 
   // Is the packager bun?
   get bun() {
-    return this.packager === 'bun'
+    return this.options.bun || this.packager === 'bun'
   }
 
   // How to install python (switched from buster to bullseye)
@@ -740,7 +741,7 @@ export class GDF {
     } else if (this.#pj.main) {
       return [this.packager === 'bun' ? 'bun' : 'node', this.#pj.main]
     } else if (this.svelte) {
-      return ['bun', './build/index.js']
+      return [this.bun ? 'bun' : 'node', './build/index.js']
     } else if (this.packager === 'bun') {
       return ['bun', 'index.ts']
     } else {

index.js

@@ -28,6 +28,10 @@ const options = yargs((hideBin(process.argv)))
     describe: 'if set to "defer" will run build at deploy time',
     type: 'string'
   })
+  .option('bun', {
+    describe: 'use bun instead of node',
+    type: 'boolean'
+  })
   .option('cmd', {
     describe: 'CMD to be used in the Dockerfile',
     type: 'string'