phase 4 first review and QA

src/types.rs

@@ -7,6 +7,12 @@ pub struct Config {
     pub bind_address: String,
     pub data_source_url: String,
     pub log_file_path: Option<String>,
+    #[serde(default = "default_allowed_origins")]
+    pub allowed_origins: Vec<String>,
+}
+
+fn default_allowed_origins() -> Vec<String> {
+    vec![]
 }
 
 impl Default for Config {
@@ -17,6 +23,7 @@ impl Default for Config {
             data_source_url: "https://statbank.hagstova.fo/api/v1/fo/H2/VV/VV01/fisknv_md.px"
                 .to_string(),
             log_file_path: Some("hagfish.log".to_string()),
+            allowed_origins: default_allowed_origins(),
         }
     }
 }