Set NODE_USE_ENV_PROXY in main.js and update workflow

Moved NODE_USE_ENV_PROXY environment variable assignment from the GitHub Actions workflow to main.js for consistent runtime configuration. This change ensures the variable is always set when the application runs, regardless of workflow environment settings.

.github/workflows/test.yml

@@ -45,7 +45,6 @@ jobs:
       - uses: ./ # Uses the action in the root directory
         id: test
         env:
-          NODE_USE_ENV_PROXY: 1
           https_proxy: https://example.com
         with:
           app-id: ${{ vars.TEST_APP_ID }}

main.js

@@ -15,6 +15,8 @@ if (!process.env.GITHUB_REPOSITORY_OWNER) {
   throw new Error("GITHUB_REPOSITORY_OWNER missing, must be set to '<owner>'");
 }
 
+process.env.NODE_USE_ENV_PROXY = "1";
+
 const appId = core.getInput("app-id");
 const privateKey = core.getInput("private-key");
 const owner = core.getInput("owner");
@@ -38,7 +40,7 @@ export default main(
   core,
   createAppAuth,
   request,
-  skipTokenRevoke,
+  skipTokenRevoke
 ).catch((error) => {
   /* c8 ignore next 3 */
   console.error(error);