Add github_issue input to action.yml for analyzing current pull requests

Author: pelikhan

action.yml

@@ -57,6 +57,10 @@ inputs:
       (https://microsoft.github.io/genaiscript/reference/github-actions/#github\
       -models-permissions)."
     required: false
+  github_issue:
+    description: "GitHub issue number to analyze. If not provided, the action will\
+      \ analyze the current pull request."
+    required: false
   video_url:
     description: "Direct video URL to analyze (alternative to extracting from issue body)"
     required: false