ci : add on push/pull_request paths ruby job (#3833)

* ci : add on push/pull_request paths ruby job

This commit adds paths to bindings-ruby to only build if changes where
made to bindings/ruby or to include/whisper.h.

* ci : add additional paths [no ci]

.github/workflows/bindings-ruby.yml

@@ -4,8 +4,19 @@ on:
   push:
     branches:
       - master
+    paths:
+      - bindings/ruby/**
+      - include/whisper.h
+      - examples/common-whisper.h
+      - ggml/include/ggml.h
+
   pull_request:
     types: [opened, synchronize, reopened]
+    paths:
+      - bindings/ruby/**
+      - include/whisper.h
+      - examples/common-whisper.h
+      - ggml/include/ggml.h
 
 jobs:
   ubuntu-22: