Add env var for package prefix in cli template generator (#124)

* add global env var for package prefix
in cli template generator

* Update cli/commands/init.ts

* Update cli/commands/init.ts

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Co-authored-by: modmuss <modmuss50@gmail.com>

Author: cputnam-a11y

cli/commands/init.ts

@@ -219,7 +219,7 @@ async function promptUser(
 
   const packageName: string = cli.packageName ?? await Input.prompt({
     message: "Choose a package name",
-    default: generator.formatPackageName(modId),
+    default: generator.formatPackageName((Deno.env.get("FABRIC_MOD_GENERATOR_GLOBAL_PACKAGE_PREFIX") ?? "") + modId),
     transform: (value) => {
       return generator.formatPackageName(value);
     },