fix, ci: allow all origins in docker by default

Earthfile

@@ -29,6 +29,7 @@ docker:
   CMD ["serve", "/vault", "--bind", "0.0.0.0:8093"]
   EXPOSE 8093
   ENV UPEND_NO_DESKTOP=true
+  ENV UPEND_ALLOW_HOST='*'
   ARG tag=trunk
   SAVE IMAGE --push upend/upend:$tag
 

cli/src/main.rs

@@ -173,7 +173,7 @@ struct ServeArgs {
     key: Option<String>,
 
     /// Allowed host/domain name the API can serve.
-    #[arg(long)]
+    #[arg(long, env = "UPEND_ALLOW_HOST")]
     allow_host: Vec<String>,
 }