[corepack] Make opt-in (#1905)

## Summary

TSIA

## How was it tested?

Author: mikeland73

plugins/nodejs.json

@@ -1,15 +1,15 @@
 {
     "$schema": "https://raw.githubusercontent.com/jetpack-io/devbox/main/.schema/devbox-plugin.schema.json",
-    "version": "0.0.1",
+    "version": "0.0.2",
     "name": "nodejs",
-    "readme": "Devbox automatically configures Corepack for Nodejs. You can install Yarn or Pnpm by adding them to your `package.json` file using `packageManager`\nCorepack binaries will be installed in your local `.devbox` directory",
-    "env" : {
-        "PATH": "{{ .Virtenv }}/corepack-bin/:$PATH"
-    },
+    "readme": "Devbox automatically configures Corepack for Nodejs when DEVBOX_COREPACK_ENABLED=1. You can install Yarn or Pnpm by adding them to your `package.json` file using `packageManager`\nCorepack binaries will be installed in your local `.devbox` directory",
     "shell": {
         "init_hook": [
-            "mkdir -p {{ .Virtenv }}/corepack-bin",
-            "corepack enable --install-directory \"{{ .Virtenv }}/corepack-bin/\""
+            "test -z $DEVBOX_COREPACK_ENABLED || corepack enable --install-directory \"{{ .Virtenv }}/corepack-bin/\"",
+            "test -z $DEVBOX_COREPACK_ENABLED || export PATH=\"{{ .Virtenv }}/corepack-bin/:$PATH\""
         ]
+    },
+    "create_files": {
+      "{{ .Virtenv }}/corepack-bin": ""
     }
 }