chore: add debug info about ceredentials processing

Author: minherz

src/createGACFile.ts

@@ -20,12 +20,14 @@ import { writeSync, existsSync } from "fs";
 // Set up Google Application Credentials for use by the Firebase CLI
 // https://cloud.google.com/docs/authentication/production#finding_credentials_automatically
 export async function createGacFile(googleApplicationCredentials: string) {
+  console.debug("processing GAC credentials: " + googleApplicationCredentials)
   try {
     if (existsSync(googleApplicationCredentials)) {
       return googleApplicationCredentials;
     }
   }
   catch (e) {
+    console.log("failed to check existence of %s\nerror: %O", googleApplicationCredentials, e)
     // googleApplicationCredentials is not a path to a file
   }
   const tmpFile = fileSync({ postfix: ".json" });