Run JuliaSyntax job only for changes to JuliaSyntax/** files

Author: topolarity

pipelines/main/misc/juliasyntax.launch.yml

@@ -9,6 +9,7 @@ steps:
           context: "JuliaSyntax"
     steps:
       - label: "Launch JuliaSyntax jobs"
+        if_changed: "JuliaSyntax/**"
         plugins:
           - JuliaCI/external-buildkite#v1:
               version: "./.buildkite-external-version"