Refactor error logging in main.go for Econumo API requests and improv…

…e response handling. Updated log messages for clarity and added error handling for non-200 status codes when sending currency rates.

Check API responses & add line-feeds to logs (#2)

* Check econumo API HTTP response codes

Before: `Currencies sent to econumo API successfully: {"items":["USD","CAD"]}`
After: `2024/12/27 16:12:47 Failed to send currencies data to econumo API. Status code: 500`

* Adding line-feeds to logs

Before: `Currencies sent to econumo API successfully: {"items":["USD","CAD"]}2024/12/27 16:09:49 Failed to fetch currency rates. Status code: 403`
After: ```Currencies sent to econumo API successfully: {"items":["USD","CAD"]}
2024/12/27 16:09:49 Failed to fetch currency rates. Status code: 403```

Update environment variable references from ECONUMO_API_URL to ECONUM…

…O_BASE_URL.

Enhance release workflow by adding ARM64 build and upload steps.

Update .env.example, .gitignore, main.go, and daily-update.yml

Update .env.example, .gitignore, main.go, and daily-update.yml

Update gitignore