add async support do diesel.rs

[gabriel123495]

Backend

SQLite

What do you want to add to diesel?

add async support to diesel.rs

Implementation notes

use diesel::prelude::*;
use dotenvy::dotenv;
use std::env;

pub async fn establish_connection() -> SqliteConnection {
    dotenv().ok();

    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
    SqliteConnection::establish(&database_url)
        .unwrap_or_else(|_| panic!("Error connecting to {}", database_url))
}

Additional details

i was making a crud in diesel and rocket (https://github.com/gabriel123495/rocket-mvc-template) and noticed it didn't supported async/await so i needed to reweite the code using sync

Checklist

• I have already looked over the issue tracker and the discussion forum for similar possible closed issues.

[weiznich]

Duplicate of #399