Fix sessions persisting across server restart

Need a non-random session secret.

README.md

@@ -67,6 +67,7 @@ builds
    SMTP_USER=user
    SMTP_PASSWORD=password
    EMAIL_FROM="crawlnicle <no-reply@mail.crawlnicle.com>"
+   SESSION_SECRET=64-bytes-of-secret
    ```
 
 1. Run `just migrate` (or `sqlx migrate run`) which will run all the database

src/config.rs

@@ -30,4 +30,6 @@ pub struct Config {
     pub smtp_password: String,
     #[clap(long, env)]
     pub email_from: Mailbox,
+    #[clap(long, env)]
+    pub session_secret: String,
 }

src/main.rs

@@ -67,7 +67,7 @@ async fn main() -> Result<()> {
     let domain_locks = DomainLocks::new();
     let client = Client::builder().user_agent(USER_AGENT).build()?;
 
-    let secret = rand::thread_rng().gen::<[u8; 64]>();
+    let secret = config.session_secret.as_bytes();
 
     let pool = PgPoolOptions::new()
         .max_connections(config.database_max_connections)