add LOCAL_DOMAIN config value

.env.default

@@ -7,6 +7,9 @@
 # Note: predefined environment variables override the values specified here.
 #
 
+# Domain name of this instance (the domain.tld part in @username@domain.tld)
+LOCAL_DOMAIN=
+
 # IP address or hostname to bind to
 BIND_ADDR=localhost
 

src/conf.rs

@@ -6,6 +6,7 @@ pub struct Config {
     pub bind_port: u16,
     pub database_url: String,
     pub jwt_secret: Vec<u8>,
+    pub local_domain: String,
 }
 
 impl Config {
@@ -23,6 +24,7 @@ impl Config {
                     .expect("JWT_SECRET must be a 32-byte hex string")
                     .as_str(),
             ),
+            local_domain: env::var("LOCAL_DOMAIN").expect("LOCAL_DOMAIN not specified"),
         }
     }
 }