fix: return env vars to bundler (#16)

## Why?

Return parsed env vars, the bundler header wasn't receiving them as the
function wasn't returning.

## How?

- Add missing return statement

## Tickets?

- no ticket

## Contribution checklist?

- [x] The commit messages are detailed
- [x] The `build` command runs locally
- [ ] Assets or static content are linked and stored in the project
- [x] You have manually tested
- [ ] You have provided tests

## Security checklist?

- [ ] Sensitive data has been identified and is being protected properly
- [ ] Injection has been prevented (parameterized queries, no eval or
system calls)

## Preview?

Optionally, provide the preview url here

---------

Co-authored-by: GitHub Action <[email protected]>

src/commands/functions/utils/getCodeFromPath.ts

@@ -1,5 +1,6 @@
 import * as fs from 'node:fs';
 import * as os from 'node:os';
+
 // TODO: These error messages should be revised
 // e.g. FleekFunctionPathNotValidError happens regardless of bundling
 import {
@@ -45,7 +46,7 @@ const showUnsupportedModules = (args: ShowUnsupportedModulesArgs) => {
 };
 
 const buildEnvVars = (args: { env: EnvironmentVariables }) => {
-  Object.entries(args.env)
+  return Object.entries(args.env)
     .map(([key, value]) => `${key}: "${value}"`)
     .join(',');
 };