Note about the comment parser and the x86_64-linux limit on tests

ofborg/src/commentparser.rs

@@ -183,9 +183,9 @@ baz"));
     #[test]
     fn test_comment() {
         assert_eq!(Some(vec![Instruction::Build(Subset::NixOS, vec![
-            String::from("tests.foo"),
-            String::from("tests.bar"),
-            String::from("tests.baz")
+            String::from("tests.foo.x86_64-linux"),
+            String::from("tests.bar.x86_64-linux"),
+            String::from("tests.baz.x86_64-linux")
         ])]),
                    parse("@GrahamCOfBorg test foo bar baz"));
     }

ofborg/src/tasks/build.rs

@@ -71,6 +71,8 @@ impl worker::SimpleWorker for BuildWorker {
             _ => "./default.nix"
         };
 
+        // Note: Don't change the system limiter until the system isn't
+        // hardcoded to x86_64-linux in the githubcommentfilter
         if buildfile == "./nixos/release.nix" && self.system != "x86_64-linux" {
             // NixOS jobs get routed to all builders, even though darwin
             // cannot build them.