Update the workflow for checking changed go files

Since, we changed the code structure, we need to change the workflow in
order to check the cmd and hops directories, for changed go files,
instead of the top directory in the repository.

Signed-off-by: Charalampos Mainas <[email protected]>

.github/workflows/build-trigger.yml

@@ -37,7 +37,8 @@ jobs:
             dockerfile:
               - 'Dockerfile'
             go:
-              - '*.go'
+              - 'cmd/*.go'
+              - 'hops/*.go'
               - 'Makefile'
               - '*.mod'